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Going up against IG, CSM, and demons in a custom escalation game with friends. How might this starter list fair?

HQ Librarian, hammer

Strike Squad x5, Razorback w lascannon & TL plasma gun

Purifier squad x5, Razorback w lascannon & TL plasma gun.

Aaand that's it.

I think what you have is pretty good model count for GK. Do you know what type of missions you're going to play? If they're objective based missions then I'd say what you have here will do decently. I assume you plan to deep strike the Strike Squad with the Librarian attached while the razorback captures objectives and shoots stuff? That's as good a plan as any.

That's a pretty straight forward list. It should do fine. I typically favor the NSF personally. Libby with 2x termie squads, same basic model count except for the razorbacks. 10 2+ is a lot for any army to deal with, especially at 500 points.

I would leave the razorbacks at home. They are too fragile for their cost and perform the same role as a rhino.

You could squeeze 3x5 pagks, 2 rhinos and the libby at 500 for an MSU approach.
Or 5 pagks rhino and 5 GKTs fully tooled + libby.
Or lastly 2x5 GKTs fully tooled + libby. I would suggest something like this instead.

Looks fine. The Razorbacks are fragile, so you're likely to give First Blood to your opponent. You might also consider putting the Purifiers in a Rhino so they can cast Cleansing Flame out of it, and have the other Razorback stay at a range while the Strike Squad DS in turn 1.

Or if you wanted to try Terminators:

140 Librarian: ML3, Storm Bolter
185Terminators: Psycannon
175Terminators: Incinerator

Or if you want to get ridiculous:

110 Librarian
195 Terminators: Psycannon, Hammer
195 Dreadknight: Teleporter, H. Psycannon