Just as a side note - this may be difficult to do. While many med schools are flexible, they tend not to like to hear from applicant that they are looking for a “flexible” school. As you mentioned, some schools offer the option of taking 3 years to complete the first two years of med school, but again, this is not something you want to ask about. Med schools prefer that everyone follow the “normal” path.
You also probably don’t want to take more than a year off. The longer you drag it out, the more difficult it seems to be to finish (and more difficult to do well on board exams). Many schools may actually limit you to how long after matriculating you must complete your coursework. At many schools, 6 years are allowed, but others only allow 5.