Sounds like your problem is bigger than HOEPA. How did your upper management become upper management with attitudes like this? Willful violations are bad news. For TILA the criminal penalties are fines up to $5000 and/or imprisonment up to one year. Civil penalties are two times the total finance charge up to $1000 but not less than $100...for each offense.
In addition to TILA's penalties, you would never be able to sell the loan on the secondary market.
It does not take that long for a manual computation. Why would they want to chance this with the regulators?
If they insist on doing this, I would make sure the decision to do this is in writing so that they could not pin this on you at a later date.