Except under extreme emergency...it's best not to breed with femmed seeds. Best to use normal breeding process to continue quality genetics, and fem your own. Make sure you keep the genteics seperate.

Femming femmed seeds can bring about genetic defects and undesirable genetic traits like suceptibility to stress, overstretching, all aroma, no 'kick'...

If you absolutely have to breed femmed seeds (if running out of seeds) best to pollinate with a true male.

Possible...yes. Desirable...no. Cannabis genetics have been dicked-with enough, IMHO.