anothername: G15 Keyboard & G5 Mouse. But looks like I found it with your latest links. Thanks! :)
edit:
Ok, did not do much, but did not break anything either; accidentally got this carambis driver updater thing on (only setup in the G5 files) which looks not uninteresting but... I need to ponder on that one. Too much time already wasted for my luxury problem. Thanks for trying to help :)
v3: I haven't fully understood from the above, is everything working fine now? Feel free to say if otherwise, I haven't searched for the specific drivers since you mentioned finding them.
Its actually a minor thing. System config recognizes them as generic gaming mouse & keyboard; the only technically (slightly) annoying thing is speed adjustment on the mouse does not work.
HereForTheBeer: You could try installing Slimdrivers and letting it do its magic:
https://www.slimwareutilities.com/slimdrivers.php Not sure how well it works for peripherals, tho...
I'll try it out these days. Reads interesting, thanks :)