Ok, back from the gig. Went absolutely great (no, not fantastic, but that wasn't to be expected due to several things, most of them not related to my rig). Defenitely the best "first gig with a new setup" experience in the last several years. Add to this it's been a telephone band, no rehearsals, random tunes and what not - hence exactly why I wanted a global block functionality so bad.
The Stomp patch I used at first wasn't ideal as it got a tad honky (clean Lonestar channel), so I switched to a similar patch using the Princess and things were just nice (possibly still one of the best pedal platform amps in the HX series). For the next gig of this kind I'll prepare the Grammatico GSG, though. And once it's getting dirtier, I will use the 2203 or Voltage.
Anyhow, as said, I will defenitely not need to use something external for cleans. The Transparent amp model I was using may need a little EQ-ing, though, but just to suit my taste for cleans better, it's defenitely very usable as is, with the Natural OD in front there's just the right amount of hair for some chunkier rhythm guitars.
Whatever, this leaves plenty of room to fool around with the Stomp.
Oh btw, the wah (standard Cry Baby) is just fine, too, used it quite a bit (I only wish the EXP pedal would remember it's switch state when switching patches).
But that's not even all. For most of the second set I switched to another bank I had prepared, same organisation but no Stomp for dirt stuff, just the internal amps. Used the X-Crunch and again the Natural OD for "more" (and my usual pre-compressor, post-EQ and some delay switching for leads). And what could I possibly say? It wasn't half as bad as I had expected. In fact, it's been perfectly fine for this gig. I was happy to go back to the Stomp bank for the third set, though.
As you might've guessed already, I'm pretty happy with how things turned out - and not only because it all started so miserably but especially as this will defenitely become my main rig. And it'll only get better once it's neatly organized on a board and when things can be controlled via TouchOSC.