If you can ever see the resistance in a wire with an ohmmeter, it is a corroded connection providing it, and it won't be stable. You could hack a lighter relay in there (the starter solenoid is a relay) as a short cut, but you'll be back into it as the corrosion continues. A pro wouldn't do this unless he likes seeing you back in the shop.

Now, I would do it (cuz I'm a hacker and I love seeing my customers back) but with full knowledge I'll be doing a rescue or teaching my kids to poke screwdrivers at starter wiring.

Where to where are you measuring the resistance? I have a book on the early prod 93's but not one on the late ones with the battery-mounted fuse array. The Mitchell drawing is the only one I have for that and it disappoints me with mistakes.
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Art Benstein near Baltimore

It may be that your sole purpose in life is simply be kind to others.