Dont think you could instruct and do UAS. (as already said).
I however did my ATPL's and instructor course in a year off. Started instructing the summer before 1st year uni, and then worked most weekends, and full time easter and summer (teaching the RAF flying scholarships).
By the end of summer that I graduated I had 2000 hrs..... (3 yr course) so yes it is possible. (Oh and I passed my degree - 2:1).