I think if there is a good candidate in adding assets to Compound, than LP tokens are indeed that. However there are some obvious issues with oracle, as highly doubtful they going to be reported by coinbase anytime soon. And borrow side is also questionable, unless borrow CAP is going to be zero for them. That’s a good idea i think, but likely very far shot.
As for Maker accepting them, it’s a bit of exxageration. From 2,300 M Of collateral at maker total 21 M combined dedicated for all 7 UNILP tokens together (3M each) is more like a test mode than any sort of actual usage as collateral.