Well, if price and time are no problem, Amphenol's mil circular connectors can be pressed into
this service; P-lok as described here
Amphe-power connectors
seems appropriate, but... it's a lot of work and a lot of accessories to make
a pair of connectors connect mechanically and electrically, and stocking distributors are
few. I got a six-month lead time quote on some of the oddballs, once: quite a shock.
One advantage; if you want to remote-switch your vac, it just needs a couple of extra pins, and
there's lots of 'insert' pinouts available.