I had my share of trouble with the UMO feeder. I've been running the Geohagen feeder upgrade trouble free for over 4 years. You can find it on Thingiverse. Mostly it can be built with parts you already have from the original feeder. You'll need to source a custom feeder wheel and a bearing or two. I made my own feeder wheel, but they were available commercially. Not sure if they still are.
I think the UMO feeder is great as is - that's why there aren't as many modifications to it as for the UM2. My favorite mod is the one that makes it quieter
However you can indeed mount the iroberti feeder on a UMO if you want to. It's not as sturdy as the UMO feeder:
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