Lee,
Yes I've watched many Stagea videos and I think they are incredible instruments. In relation to those wonderful performances there is something I don't like and it's they are pre programmed and all the players, if they are good of course, sound the same like a copy of the original song. That's great for a show but in my case as a home player I would get very bored practicing the exact same pattern and I would give up on the try. I love to flow along the music so I've never taken the time to program the registrations in my Psr for a performance and I know I wouldn't do it on a Stagea either. I play less than an hour a day during the week (when I can) and I wouldn't be able to practice enough those arrangements.
I have not found here other pedals than the Pk5 but I know Roland has another 2 octave model which is much more expensive and lacks all the programmability of the Pk5. Since it is a dedicated pedal for Roland instruments I was afraid it could not work properly with other brands and I didn't take the risk to order one. On the other hand remember you need spare room for a couple of volume pedals and foot switches for your right foot and it won't be easy to place them on top of the pedalboard cabinet. I use two pedals, one for volume the other for modulation wheel functions and 4 switches, 2 for sustain for middle an upper manuals respectively and two for variation up and break fill in the Psr.
Lee what you can do is only limited by your imagination.

Victor