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Man, that sure does seem like a LOT of work for very little if no gain.
On a basic level you are trying to heat the trans fluid up so it is "thinner" right? So why not attack it from the other direction? Run "thinner" fluid to start with? The down side to that of course being that when it is hot out it may be too thin. But it wouldn't be too hard to figure out the balance. What did you say that trans took? 75/90? Man, that is some serious fluid for a manual trans. Most stuff runs ATF now. You could probably run a real good synthetic ATF or at least a low viscosity synthetic gear oil and probably replicate "hot" standard gear oil really well.
Back in the day we used to run GM Syncromesh in transmission that took gear oil in racing applications (heavy load). Stuff worked great and is a lot "thinner" than gear oil.
Here are some viscosity #'s for the different fluids:
ATF 6.5-8.5cst
Syncromesh 9.5cst
75w85 9.8-11.5cst
75w90 12.8-14.5 cst
Switching form 75w90 to 75w85 is a pretty big jump (about 22% average)
Switching from 75w90 to Syncromesh is 31%
I'm not sure you will see a 22-31% decrease in "drag" by pre-heating your current fluid.
Just a thought.
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