as an a4 mk1 owner its entirely possible to use overbridge with just renoise. overbridge support of the a4 really just amounts to having redundant access to the a4 with a resource heavy pseudo vst. form over function def applies.
it does show each tracks oscs and filters and various other important info that normally requires menu dives but if you’re actually using the a4 seriously you would have ran into the need for a midi controller that allows you to actually utilize the a4s features n expressive capabilities. unless you have the analog keys you need an exernal controller to use the mod wheel. Since most serious a4 users will have acquired a controller because the a4 sounds like solid doodoo with just note on and note off data they will have likely mapped most of the tasty stuff to their controller already, overbridge is quite overhyped outside of the os getting to use the device as an audio interface. it does aid in some of the programming of the a4 if you do not have any controller whatsoever, it is still awkward and youre likely missing out on what makes the a4 worth experiencing
heres a pic of the vst’ish interface, you should immediately see why it can work solely with renoise without any issues.