Vintage Synth Repair

Hi 

A while back I asked for advice of how to convert the power supply of 
the Moog Source from 110V to 220V. I got several tips and hints from 
you guys, now I got it rewired and it's fully functional. Thanks!

Well, my next project is to purchase a Wurlitzer 200 electric piano 
from the US and it would also have to have the power supply converted 
to 220V.

Does anyone have an idea what would be the best way to do it? Is the 
psu of the wurly easily rewired for 220V? 
Otherwise I was thinking I could bypass the dedicated psu and just 
use a multi-adapter which gives an output of anything between 1,5 - 
12V, with a reversable polarity. 
Could this work? Is there something else I should know or take in 
consideration?

Any tips or hints on the subject is appreciated!

Thanks,
Einar Ekstrom