That's a good summary.
While you mention a 'european mag release ' the P7 is different in that it's pushed forward to release .Other European ones the release is pushed backward !! That is a significant difference ! During IPSC matches I've surprized ROs in the speed I've been able to reload ."How can he reload so fast ?"
You 'milk it out' by lowering you're left hand , with forefinger on the floorplate extension and thumb pushing foreward on the release.In other words squeezing thumb and forefinger together as you pull you're hand down and magazine out. This provides very fast and positive reload. Your hand then is ready ,in position to to pick up the next mag. !!
For the M series I found it easy to use the trigger finger to operate the release and in the process it keeps the trigger finger away from the trigger.