I posted in another thread what I would do...
I'd launch the JCM 800SE. I'd Dual Masters and would have Gain 1 and Gain 2. Gain 1 would be authentic 800 out of the box, Gain 2 would be the modded high gain sound that basically launched the modding industry i.e. the Friedmans, Ground Zero, Mono etc's... of the world. I'd also add a Resonance knob, built in gate, great loop, midi, the attenuator mode from the YJM and extras like IR's for the modern players.
None of this would be a stretch i.e. the attenuator, the gate (from the KK model which has been copied in pedal format) and resonance from the JVM's. Trick here is the stock 800 tone has to be authentic and built in the UK.
I'd buy something like that in a second.