Boudreax, I had the same problem when I began to shoot IPSC, and used the method your thinking about using, middle finger right hand. The sargent at arms called me out and took me to a safe room, asked me demonstrate a reload, which I did, but the normal way, with my thumb. He then says " that's not what you were doing out on the range, and then he asks to see my pistol, operates the mag release, looks at me and says, g_d damn, no wonder, take the spring out of your mag release and cut 3 coils off of it to start. " That really helped, and I continue to tune my releases now 30 years later. I like the Smith and Alexander ambi release, on those pistols I have them installed on, I use my trigger finger to operate the release, safer and faster, as you do not shift your grip at all, and your finger is nowhere near the bangswitch during the reload. You do need to know how the mag release works, and all you need is a dremel or similiar tool, with a small carbide round burr, to clearance the frame where the ambi release has moving parts. If you look at how it works, versus the old release, you'll get the ideal. If your uncomfortable with it, this is an operation the smith should not charge an arm and a leg for, my labor price is 25 bucks, but don't go beating up a smith who is higher, just use for reference to see if it is somewhere near fair. The exception is a wide body Para-Ordnance, I own 3 para's and love them, but some of their tolerances are not up to par, 2 notably, the hole in the frame for the mainspring housing, if you go to install a magwell/mainspring housing, expect to fit it, the hole is probably not going to line up, they use plastic mainspring housing that are very forgiving if the pin hole is off a few thousandths, the metal pin will push through the plastic easy. On the ambi safety, the location of the release hole is not always perfect and you need to drill and tap a hole, install a set screw to push the magazine to one side for proper retension, it comes with the ambi safety kit, along with a template, to show where to drill the hole.
You can always get an over sized button or paddle release which works well too, but may not be compatible with some holsters, and the mag may release when in the holster under different conditions.