I don't know where you can get the optional card. Do you have an Eve/NET already?
As for the front panel, do you want to have your Harmonizer completely original or would you mind something custom? There are several of us who specialize in synth repairs and upgrades. I'm booked with software and pcb development for at least the next six months, but if you haven't found anything by then, I can paint and silkscreen the front panel of your 7000 however you want. There's a really good guy over in the UK that you should check out too: