Even from 70-80% "medium brush" a starter SW will carry 6 yds and roll another 5 or 6 on level ground.
70-80 med brush, starter sw, full
From "light brush" even up to 60-70% you can punch longer irons as long as the distance to carry to the fairway is less than 20 yds or so. A middle iron will go about 1/3 of the listed punch distance from "light brush"
A few practice rounds intentionally hitting into this junk will make it pretty clear that the best thing to do is hit a wedge to the closest "short grass"
As far as top spin or back spin it doesn't really make much difference.
Dave