Read my other post - being an anesthesia tech is nothing but a POSITIVE thing to have listed on your application. It doesn't matter if it's a summer job, nor do you need to be certified since it's frequently OJT anyway, so it's not taking time away from whatever undergraduate program you're already working on. The in-OR anesthesia-related experience is invaluable.
EMT/ER tech aren't bad ways to go because you get patient care experience. EKG tech - nah. And your perfusion suggestion is absurd - perfusion is a dying field. There will always be a need for a few perfusionists, but their job outlook goes down every year due to the increasing use of minimally invasive off-pump cardiac procedures. I would never transfer to a specific school just to get a backup career to AA school.
RT school is fine, as is nursing school IF you get the pre-reqs along the way, which most don't. That means at some point going back and getting the physics, chemistry, etc. Most people don't start RT or nursing school with the idea of going to an AA program. And actually, most AA students probably had no clue what an AA was when they started college, unless one of their parents was an AA.