I'm not familiar with the arrangement, but I cannot imagine that there
isn't a fairly straightforward electronic solution to the problem.  Any
mechanical switch can be used to run the coil of a high-current relay,
and solid-state switches are even simpler to use than that.

What do the contact points do?  How much current do they handle?  What
voltages are involved, and is it AC or DC?  Do they turn the motor on
and off?  (This last is important because solid-state switches that
work into an inductive load must be designed to do so.)  What space
restrictions are there -- i.e., does the whole thing have to fit inside
the end-bell of a motor or something, or can something be hanging off
of the motor inside the instrument?

Mark Kinsler
Athens, Ohio