I recently replied to someone else, probably on another forum, if my response seems redundant.
I've personally tried a Gen3/4 slide-stop in one of my Gen5 guns. It did work, but didn't feel as tightly sprung as the actual Gen5 ambi slide-stop. I'm unaware of anyone, so far, who's used a Gen3/4 slide-stop in a Gen5 to any extent or has "thoroughly" tested/vetted such a substitution.
Feel free to try this swap and get back to us as to how well it's working for you.
Another option could be cutting off the offensive part of the Gen5 slide-stop; reinstalling it; and testing it after cutting it. I'd like to hear about that, too.
I do think the stock ambi Gen5 slide stop will be more reliable and less prone to breakage with its coil spring (the overall construction and metal thickness seems thicker, too), but that also remains to be seen.