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This may be slightly insane but, is it possible Minotaurs were Blackshields formed in the 30k era?

After the 21st founding in 36k, the Minotaurs eventually disappeared from records in 38k. They then reappeared in 40k bearing new heraldry, differences in structure and behaviour and access not only to a full range of high-end gear, but also out of place things such as masses of Tartaros pattern terminator armour and ability to field Contemptor Dreadnoughts.
While this can be explained by them being the High Lords of Terra's lapdogs, one particular thing to note is the fact that they somehow have a venerable Contemptor Dreadnought, which even if they were the chapter founded in 36k would be quite the feat. Also the 40k Wikia page (but not the Lexicanum) has Minotaurs listed in a conflict in 32k (Vengeance from the Void (c.M32)) alongside, of note, the Carcharodons (Raven Guard Blackshields) to deal with traitor factions, which is 4,000 years before their apparent founding.

If they were formed to deal with the traitors during the heresy before the siege of Terra, it would make sense that they had a tradition of being trained to deal with regular marines instead of chaos-powered ones since they would probably not have seen those until the very late stages of the heresy (explaining their proficiency in dealing with non-chaos marines in 40k), and also some of the Blackshields are known to have been Chymeriae, which the Minotaurs are said to be.
If they did aid in the heresy, and ultimately the defense of Terra in such a fashion, it might explain how they obtained one of the custodes weapons as a chapter relic for their chapter master also (looted off a dead body mid-battle or a reward for service?).

My personal view is that the original Minotaurs whose heraldry we see today were originally made during the heresy, but then as fanaticism in the worship of the Emperor, and along with that purity of Space Marine geneseed being more and more important, chimeric geneseed like the Minotaurs would have had to stay hidden as it was becoming considered more and more blasphemous, and so they were removed from the public eye by the High Lords. Then during the cursed founding, some faction with the ability to do so had heard rumours of the Minotaurs marines of old, and attempted to recreate them. These ended in failure, being wiped out or they simply disappeared, but at the same time would later provide the High Lords a way to re-introduce the old Blackshield chapter into the Imperium as a whole.

... I had a long day at work and lots of time to think so I could be putting far too much thought into this but, thoughts?

Neither the Minotaurs nor the Deathwatch (and, thus, Blackshields) existed during the Horus Heresy or Great Crusade eras so... no, not possible.

The Traitor Legions, and all of the warbands that they fragmented into following the death of Horus at the Siege of Terra are considered "traitorous elements". They are as active in M40 as they were in M32, M36 or M38. Plenty of such things for the Third-and-later Founding Chapters to fight.

 Psienesis wrote:
Neither the Minotaurs nor the Deathwatch (and, thus, Blackshields) existed during the Horus Heresy or Great Crusade eras so... no, not possible.

The Traitor Legions, and all of the warbands that they fragmented into following the death of Horus at the Siege of Terra are considered "traitorous elements". They are as active in M40 as they were in M32, M36 or M38. Plenty of such things for the Third-and-later Founding Chapters to fight.

Well, I may not have anything to say on the Minotaurs not existing, I can on the Blackshields.

Blackshields DID exist during the Heresy, as evidenced in the 30k rules as a playable army. However, they are a different entity in the 41st Millenium, being part of the Deathwatch. Before this, splinter groups of Astartes disavowed from their Legions to pursue their own goals alone, scrubbing off their insignia and becoming Blackshields.

It's somewhat feasible that a group of Blackshields adopted Minotaur-like heraldry (possibly Ultramarine Blackshields, from the Greco-Roman themes) and were present at the Siege of Terra. However, I think it's a bit of a stretch. But hey - no-one really knows.

The Minos, specifically, are dated to the 21st Founding, which took place in M36, though those are not considered to be the same Chapter as bears the name in M41. Regardless of whether or not there have been 2 or more Chapters bearing the name, their earliest dates go back only so far as the 21st Founding, so would not appear in the GC/Heresy era without some sort of time-travel shenanigans.