I would like to put a chaiguard on my Shimano Tourney (FC-TY30) MTB cranks to protect my pant leg from the chain. I tried a generic plastic model but it didn't fit, and I didn't really care for the look of it anyway. Ideally I would like one that bolts right up to the five holes on the big ring. I can't use a bashguard since the rings are riveted together, and in any case I want to keep the big ring.
Something like this (but with five holes instead of four) would be ideal: