Imo the leaves from a 2 week flowering plant wouldnt contain enough goodness to make the effort worthwhile not to put a downer on it. Just wait use trim after harvest. There is lots of good info I this site for other uses of trim. Imo
Unknown seed makes judging the flowering time harder week 7 is only a couple weeks off most strains finishing time. If it's for personal it's going to fine.
Would be great to let them go but if your coming into longet days it's not going to finish properly. They look great should still be nice buds when cured