Hmm, well, suggestions:
Some way to make Heat with the UMR, and/or a Heat input device to the UMR.
Perhaps a miner device powered by UMR fluid output, with a large mining speed and mining area?
actually there might be a usage for a special miner.
In my train factory after some point i tend to build of ressource patches since i need the space and have enough raw materials.
How about a miner with insane (maybe 2 or 4 middle sized cityblocks ore more?) range but a damn low productivity (0.0001-0.001 percent or so), and insane speed (100 ore per second?) -> could clear those nasty patches in cityblocks adjacent without being to op and would only be available in lategame due to need of a working UMR.