That whole first post was quite confusing for me, but I think I've worked through it.
I think an easier way to do it is:
Optimize your spending to spend as little as possible. Figure out how much, if any, of a cash cushion/emergency fund you want to keep in the bank. As your funds go over that, invest them.
That may just be an extra $100/mo. to start with. Then it will grow as you spend less and earn more. The gap between your paycheck and spending grows, so the amount above your EF left in your checking account gets higher, and then invested, each month. Except when an emergency happens, then the next month or two may be replenishing that.