You've been reading too many pay for training brochures. There are no options. Suck it up and get a multi engine job, god forbid you should sacrifice a few years to get that 500 multi like other pilots had to do in the 80s and 90s. And if you do make it to a regional, you can be sure the instructors will make it harder on you since you've only got a few dozen on the multi time. Just because they interview and hire with less than 100 doesn't mean you can pass the training. Don't take these reductions in mins for granted.