Don't do it. I believe
@Goro gave me this example. It's a bit brutal, but he's correct.
Sending a letter of intent pre-interview is analogous to a jerk guy at a bar trying to bang a hot chick promising he'll totally respect her and date her if she's DTF tonight. What do you think...? Pre-interview intent letters do absolutely nothing. I'm convinced that post-interview letters of intent also do nothing. Once a medical admissions committee has made their decision, only in extremely rare instances can a post-interview LoR help. The example I know was a friend of mine. He had a
LizzyM of 80+ and was hellbent on going to a low-tier medical school and was waitlisted. He sent in a letter of intent and said why he wanted to go their. His mom and dad were doctors there, the school was practically in his backyard, and he would have the strongest support system at this school. They actually admitted him when he confessed this in his letter. If its in hopes of trying to bump up your Waitlist ranking, I doubt an admissions committee cares. I don't think that's right, but it is what it is.
A great lesson for life is the following: Don't be desperate. Ever. In all aspects of your life. If you are desperate, that's a sign something is wrong. I say this from experience. I was desperate AF during my first application dying to get admitted anywhere, and that's not the correct mentality. I'm sorry for your situation OP, but remember, medical schools aren't going anywhere - you can always reapply, broaden/diversify your school list for future cycles. If 1000s of other students do this across the country, you absolutely capable of doing it as well. You got this.