I think you should be fine swapping for a standard mag release, can confirm when I get home if nobody else chimes in. You can probably trade for one here on the forum if needs be, I know I really like the shadow 2 paddle release and would gladly trade a standard one for it. As far as the springs I don’t think you would gain any “reliability” per se in swapping out for heavier springs, although changing out the hammer spring for a heavier one might make you “feel” a little better about the first DA trigger pull being safer for carry, especially considering the shadow 2 does not have the FPB like a standard 75b or variant.