Hi! I feel obliged to answer your question because I struggled to find answers for this, and now I am in a position to be helpful. I'm an international student who applied the past cycle and is starting osteopathic medical school this year. To answer your question, getting into DO school is A LOT easier than MD schools for international students. I have pretty good but not Harvard Stanford stats (3.75/515), applied to basically all the MD schools I could, got one interview (rejected). I applied to like 5 D.O. schools (the older, more established ones), and got interviews to them all. I interviewed at 4, and was accepted to 3. Fellow international students in my friend group all have similar stats, and getting into MD was really luck of the draw (only one of us ended up accepted). I was the only one who really pursued the D.O. route actively, probably because it's not so well known to internationals. I think if you have decent stats, say 3.6/510, you are almost certainly getting into D.O. school if you apply widely. The standards are still somewhat higher, but reasonable (not Harvard/Stanford). This is just speculation, but I think there a a few reasons D.O. school is easier than M.D. school for international students:
1) You need to be head and shoulders above your fellow applicants to gain acceptance as an international student (that's certainly easier at D.O. schools where the average is 3.5/505 as opposed to MD where the average is 3.7/510).
2) Private D.O. schools tend to have less regional bias, allowing internationals a more fair chance. Private M.D. schools also tend to have less regional bias but tend to be very prestigious (think Harvard, Yale). State M.D. schools we may have the stats for but usually outright do not accept international students.
3) D.O. school is less well known to (usually very qualified) international students, who tend to cluster their applications towards the thirty or so M.D. schools that will accept them. This results in fierce competition, as the schools will have their pick of 4.0/520/Ph.D's among the international students.
Sorry if this is long winded, but here is my concrete advice for you:
1) Kill the MCAT, get a ton of clinical experience, take a gap year. Your GPA would still have three semesters to grow.
2) Shadow a D.O. and really show that you are committed to osteopathic medicine and not using it as a backup
3) Apply early and widely. D.O. schools tend to be rolling.
4) Without being eligible for federal financial aid, make sure you have the funding for medical school.
5) Don't get caught up in the "unfairness" of it all and comparing yourself with U.S. peers through the process. All we can do is to try our best.
Good luck!