It sounds like you are trying to do this complicated deal without a Buyer's Agent and without a Loan Officer:
Either that, or, no one is helping you; which is it?
If you are between a rock and hard place; it sounds like you have only one choice:
You need to Counter that you need up to 6 months to close with an explanation, weekly updates and however long Homepath says until the Loan Contingency can be released: There do not seem to be any other choices.
If they say NO, then you are probably better off losing it now.
Good luck and may God Bless