This isn’t an instant or easy solution to mapping your FC1 to the Blofeld, but it will work extremely well.
Consider purchasing a BomeBox with Bome Midi Translator Pro (“BMTP”) software. BomeBox is a very compact and well constructed microcontroller (it’s a very small box) with the power to map and translate virtually any midi message into any other.
You could easily program the BomeBox to trigger on your FC1 messages and spit out the CC#0 127 + PC messages that Blofeld will interpret correctly and switch multi patches.
I “program” and test in BMTP in a Mac, then load the finished product into the BomeBox, where it reliably executes.
Once you understand BMTP, almost any Midi project becomes doable relatively easily.
My BomeBox acts as the “brain” of my complex rig, making my KMI Softstep pedal a super powerful controller for everything. I’ve got Softstep keys doing toggle (tap on, tap off), long press and short press. The BomeBox sets the LED’s and 4 character display on the Softstep EXACTLY the way I want it.
If you are technical, BomeBox is an incredible solution. If you aren’t willing to learn a bit of programming, it’s not right for you. By the way, Bome’s support is absolutely first rate.
I’m happy to discuss further if you’d like.