Is this simple to do? Like with the 36 watt. Or is the vvr option better?

Thank you all for any input.

You could  fill a book with information regarding the topics that "grod915" has discussed. I have heard a lot of "Half Power" switches over the years, and a lot of guys have praised them.  I just have never felt they worked that well. And do not confuse half power with half volume.  Again, "grod915" has mentioned a VVR. I think those are a better solution for most circumstances. Of course, the best solution is trying as many different options as you can, so your ears can have a vote.
Good Luck

I've had 4 amps made with power scaling or VVR, and to me it's no better than a THD hotplate (Note: it only works if you have a master vol, otherwise it's horribly fizzy). Triode mode is no worse I think.
I recommend PPIMV + THD hotplate, but really, you never get the proper tone at quieter volume.
Even the half power on the 4 valve models is not the same. I have it on a DZ30, on half power, the headroom is gone, the rectifier is over-spec and the output transformer is not saturating the same way, a different sound, but the closest to full power. But --- not a big decrease in volume.

For quiet levels with real tone, the best solution is an ISO cab, and run you mic'd output through your recording setup into monitors or headphones.
The Randall one is the best I've tried, but it's single skin and the speaker is attached to the outer chassis. Best to build one yourself. Double skinned is best
with insulation in between, or convert a cupboard (closet?) into an ISO room.
I have an Axetrak too. It's convenient, but the tone is poor. You can rescue it a little with EQ, but best to use 12" speakers