A friend’s kid at one of the NE BS did an SYA year in Spain and ended up at Midd without repeating any years. They did take a gap year to avoid starting during covid.
In this case, with FL as the intended major, SYA was indeed the best prep and no handicap.
Another kid I know, from LPS, did another program and had a heck of a time with college admissions (and arguably college prep). They ended up at a top law school, so definitely “course-corrected” in college.
I think that you would be best served by having this conversation with the CC at your school (which, knowing you, is already scheduled.) 
The reality is that unless one does a program like this and starts with at least faltering fluency, a lot of content will be sacrificed. Indeed, much is gained in terms of language acquisition and all the other things that don’t go on a transcript, but it seems reasonable that an AO would see a lot of this as not comparable to what a student would do at their own school in terms of content alone.
Reclassing is an interesting idea. Many of my contemporaries who did a year abroad did it between high school and college. Doing it during high school feels more enlightened and also a potential edge for college applications.