I understand your desparation but please don't cross post. It
wastes our time so your answer takes longer and it wastes the time
of people looking for answers to the same problem when they hit a
dead end thread.
You are talking about merged help and the only problem I
foresee is cross project links. If you don't have any of those,
then you just need to generate merged webhelp. There are full
instructions on my site. If you do have cross project links, they
have to be created in a different way for merged webhelp so you are
going to have to revisit those links.
Subject to the topics already being finished and there not
being too many cross project links, you should be OK for the