Cat Driver,
I am intrigued .. how is there no Vmca with your modified Apache ?
. .Under US design rules, some small twins have no OEI climb requirement due to the AUW and Vso cutoffs. One just has to accept that the normal sort of twin sensibly appropriate to twin training is a dog OEI .. one can't have one's cake and eat it as well in this regard. Tinstaafl has the idea ... either reduce the gross weight appropriately (the easiest option - minimum occupants and adequate fuel) or up the power (thrust) output by an engine upgrade mod (ie bigger motor) or aftermarket bolt on blowers.
. .Another concern is that one doesn't want to play with simulated failures on other than a small engine for the usual maintenance reasons.