Well, I must admit that I've never fully understood why a decocker gun with a firing pin safety doesn't just drop to fully decocked...
But as the gun is, I can't really see any problems at all using the decock as designed and carrying it on the half cock. I've been carrying a PCR (which is 99% the same gun as the P-01) and even carrying it under a tucked in polo shirt or outside a tucked in polo shirt with a button up shirt over it, I've never had the hammer snag on a single article of clothing. In my opinion, it's more of a theoretical problem than a problem in the real world.
As to recoil... it's 9mm dude. No one should have a problem with recoil in a 28 ounce (plus ammo) pistol. I do own or have owned a gun from most major manufacturers (except H&K) and the PCR/P-01 and CZ75s in general are the most ergonomic pistols I've ever shot... Even more so than the excellent 1911.