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It's not gonna affect for the next person if I'd sell the wheels?
I'm already making a lot of changes with this bike and slowly starting to lose hope for anything to work out straight away. I'll probably look for some grip washers and try them out.
marrac-
True, it's possible they wouldn't like it, so YMMV and all that if you might sell them on. I've run wheels with only about 2mm of axle beyond the locknut face and had no trouble with them. In fact, Sheldon reckoned you could have no axle sticking out at all and you'd be just fine.
One thing you could try is removing the conical springs from the QRs. This will effectively created a void in the centre of the QR that the end of the axle would poke into. It makes fitting the wheel a bit more fiddly as the QR won't self-centre, but avoids the need for a washer.
ffm
Seriously, I'm a big advocate of not making irreversible changes except as a last resort but, in this instance, is there any reason not to just file a bit off each end of the axle?
"The ends of the axle must not protrude past the outside faces of the dropouts, or else the quick release will only tighten against them and leave the wheel loose -- sometimes a problem with thin stamped-steel dropouts on older bicycles. In this case, shorten the axle, or use the wheel on a bicycle with thicker dropouts."
https://sheldonbrown.com/skewers.html