3.5/33 are competitive stats for MD programs; more than half of applicants with those stats get in somewhere. They wont turn any heads, but if you apply broadly and have a smart strategy, you have a reasonable chance of success. That would be my focus. If you really are gunning for surgery(and honestly few who haven't even started med school yet should be hellbent/set on surgery) do all you can to boost your application to get into an MD program. As others have said, there is no way any DO should be banking on matching into a surgery field in the coming years, even though some inevitably will.
Even if you get into a US MD school, your 3.5/33 academic qualifications will be at best average or somewhat below average amongst US MD students. Keep in mind to do the types of surgeries you have to separate yourself from the pack and clearly be above average amongst US MD students. Based on your UG record, you aren't that so you will have to change your level of production. Is it doable? It has been for many. But it'll take a real commitment and change. Having said all that, there are clear advantages to having an MD vs DO and when you have competitive MD stats I would encourage you to strongly pursue the MD route.