By no means am I am expert! but from my understanding and reading here on this great forum, I will attempt to answer and will not feel bad if I am corrected :thumbsup:

1. Is there a strong possibility that by forcing these young plants into flowering at this stage that I will have ZERO yield in 9 weeks?
No.. You should still yield some how much will depend, but they should still flower.

2. If my plants do bud, but are not fully matured will harvesting this bud early make it useless or will it still be smokeable? (Remember I recognize this is nowhere near optimal)
Harvesting early will affect the quality. The quality being affected will depend on how early. Maybe these strains mature quicker?

3.Is there anything I can do in flowering to speed up the process?
Maybe use a stronger light? Not sure on you space, but if you went with a 1000w HPS you should get bigger results, but not sure if it will speed it along.

Hope that helps some and I hope my intelligent ones speak up :rastasmoke: