I've used a battery box with bass roll-off for omnis — don't recall the exact roll-off settings. But the only reason to do this, really, is to create more headroom for the other frequencies and allow you to raise the gain; you're going to want to EQ afterwards regardless. So no need to replace your UBB if you don't want.
I would suggest playing with the EQ on your bass-heavy recordings and find settings that get your recordings to a place you're happy with them. (This will probably require a lot of trial and error, playing the results back on various speakers/headphones, sleeping on it, etc.) Then save those as a preset and make them the first thing you apply to your recordings after they're made.