The VK112 doesn't have a choke either, why would you want to add a choke? If you want to redo the power section of this you'll run into trouble with the low voltage supplies.
You may be underestimating the difference a couple of power tubes makes, can you borrow the 112 from your friend again, and try a couple of things.
Plug into the VK112, connect it's effects send to the VK212's effects return, plug an empty jack into the VK112's return. You have now connected the preamp of the 112 to the power amp of the 212, how does it sound, closer to what you want?
Do the reverse, connect the effects send of the VK212 to the effects return of the 112, plug an empty jack into the VK212's return, plug your guitar into the 212. You are now using the preamp of the 212 with the power section of the 112, hows it sound, closer to what you want?
If the first method gets you closer to the sound, you want to be looking at the pre tubes in the 112 and getting the same ones, with the same gain structures in the 212.
If the second method gets you closer to the sound, you maybe want to pop a couple of those power tubes out, and run the head at 50W, but after several stories I've read on here, I'm checking the heater wiring, and it looks like you'll have to make a couple of dummy
tubes, where you just connect the heating elements but snip the pins for the plate and grids, as the power tubes appear to have their heaters wired in series. Worry about that if you get to it.
- uses Piveë Amps and you should too.