there are springs and weights to alter engagement speed.
for a series 30 there's a black spring set (as opposed to the blue one) that brings the engagement speed down to 1400 rpms with the original zinc weights (320 gr)
unfortunately that's about it.
everything else brings the engagement speed UP (up to 4500 rpms or so)
frankly for an electric motor, you want something closer to loose rubber bands
(immediate engagement, just enough power to pull the weights back together when it doesn't rotate; you get the idea)
the rest should be 'controlled' by the driven anyways (it's spring should remain unaltered)
But that's theory.. tried?? at least I haven't.
You still have that my1020 motor
A TC can be bought off ebay for around 60 bucks these days..
the springs can be unhooked rather easily and in case it doesn't work reinstalled as easily again
to sell the TC again.
(just make sure the eyelets are on the weight, not on the seam. best on opposite sides)
just saying
'sid