You are definitely an extremely competitive applicant with your GPAs as well as if you can get those hours you put in your description I think that also makes you a great applicant.
I have personally never seen a school that made a comment about someone getting all their hours during a certain period (unless it was like someone earned 500 hrs 10 years ago or something), and I wouldn't see it being an issue because you're getting those hours for the purpose of applying! As well, you can explain the career shift in one of your essays and that would likely smooth over any remainder of lingering questions the admissions committee might have. You are also basically taking a gap year and the schools would expect you to do something with that gap year--which you are! 🙂 Overall, I think you will be an extremely competitive applicant on GPAs alone, the hours you expect to get plus your research experience and your other experiences/leadership set you apart. Stay the course and I think you have a very good shot!