I don't understand, why all the hand-wringing about spoke tension on a 6-speed?
I never had a problem with a 8, 9, 10 or 11 speed on a 130 spacing.
Sounds like looking for a solution to a problem that doesn't exist.
True, there isn't really a problem, since I'm really easy on wheels. Just retro-dorking a little and wanting to shake things up.