If the problem is bad enough, you might consult darcy White down in the Pilot Health section. I believe he has an STC (Or Field Approval) for an ignition interlock in his Cub. I realize your probably flying heavier iron, though he might be a good place to start. Regardless, I'm not really sure why he had it installed, as he was always having his dog Cheeto blow in the tube for him, which kind of defeated the whole purpose...