Everyone knows that the animations used for spears+shields once you get monkeygrip are abysmal, swinging the spear around as though it is a slashing weapon. However, I have observed that NPCs equipped with shield + spear seem to use the same combat animations as if they were just wielding a spear - but they also get their shield attached to their arm. Essentially, they wield it as a two handed spear plus a shield.
I dont know much about combat animations and weapon types, or how to do this, but it is clear that it is possible to use the two handed spear animation with a shield. While this may not perfectly represent what a monkey-gripped spear should be like, it would certainly be a significant step up from the current situation.
10 - A Masterpiece, Genuinely Groundbreaking 9 - Outstanding, a Must Have 8 - Excellent, Recommended to Anyone 7 - Very Good, Deserves a Look 6 - Good, Qualified Recommendation 5 - Fair, Solid yet Unremarkable 4 - Some Merit, Requires Improvements 3 - Poor Execution, Potential Unrealized 2 - Very Little Appeal 1 - Not Recommended to Anyone