Noll 500k/220k stacked volume/blend pot
Well, "work" yes-- it WILL change the loading of the circuit, as that "volume" portion is 500, (instead of 250k) and ADD a 220K pot in the load of the main circuit for each pickup. (250k volume + 220k)
That is also a deep pot stack, check the measurements to see if it fits the control cavity.
This WILL change the tone. Likely brighter.
The volume blend stack would likely be the easiest insertion point rather than to re-wire the tone circuit.
You could go with a stacked dual volume pot BUT see the issues with blend vs dual volume debate:
Blend knob vs. 3 way switch
Blend knob vs. Two volumes for signal loss
2 volumes vs. blend pot
Benefit of Vol/Vol vs. a blend knob?
Volume/Volume or Volume/Blend
also:
Blend pot tapers
Either way, there will be an output drop when centered (or both volumes up full) due to the additional loads.
with a stacked volume/volume you CAN balance the output, leaving the switch in place, in the middle position. Dimming one pup back from full volume.
Again: this will still change the tone and output profile due to the change in the load. (brighter)
Maybe
@sunbeast can chime in