Yes, of course. It’s not this much custom changes though. Since the useage in Bforartists is around the graphical menu. The other big change is the viewport navigation. And we have of course simply removed a ton of hotkeys in the standard keymap too. But even here, we have a Bforartists Full keymap, which uses most of the Blender hotkeys 
It’s unfortunately too long ago, i cannot say what conflicts you may introduce when you change the WER keys back to SRG. One is extrude. But that is simply putting it back to E. For the other two keys you need to have a look in the input manager. But it might even work.
I made a list of the most important differences here: https://www.bforartists.de/wiki/Quickstart#changes