mgnostic, Yes, it looks like you've come up with the best idea so far. I don't care for the old torque rod system as it's easier to add differential and other adjustments by the radio. I've added separate servos to many planes in the past and it's no big deal to add the hardwood framing.
So cutting away some of the center wing sheeting will probably work out best. There is no room in between the wing bays to get my trusty home made boring tool into position.
When working with kits like these older ones are always bore servo wire holes before even laying out the parts.
I'm going to go with digital servos all the way around if possible along with a Spectrum DX 9 radio.