I'd say that the armour is reasonably similar on Morannons and Goblins, so that should work well - and if you have the goblin shields, the silhouette should read as "goblin".
I'm not convinced that shortened legs will look right, but I'd say your biggest problem would be poses - the Morannons are a lot more upright than normal orcs, and they're not nearly as hunched over as goblins.
I'd be very interested to see the results if you do give it a go!
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