Parasite
Interesting twist. Should be easilly done without running into any mineral problems.
If I have understood your model correctly:
Compared with my favorite MSY-model where HW only builds 1 turns colonizers on EB for the first year (11 turns), this new model have 1 less colonizers built at turn 11. Your model also have the colonizers built on average 2 turns later so your colonies would be a little less advanced. You have 2 useless (on slow) BSY's but full capacity on HW and you would/could have your first moon yard coming on line.
My model would have no BSY's, a HW on slow, but 2 moon yards ready and the third almost done. Also my first moon yard would normally have produced a colonizer by now making it 2 less for your model. I would be more spread out due to the 2 turns earlier colonizers, have a bit more facilities but a bit less construction capacity for a few turns (In most cases only the difference between HW with bonuses + 2 BSY's on slow and a moon yard + HW on slow).
The little trick with turning the HW off EB early sure is different. Something like that would certainly be worth trying if the starting position don't give the option of (enough) moon yards
