Sorry for the late reply.
What I did was use Time Machine and went back to a date before 10.7.4 came in. I cannot remember what that was but we might be able to date from when the discussion started. Otherwise the telephone help people maybe able to give you a download of the original Lion and then do the up dates up to 10.7.3 only
Hope that works
Yes, when you restore to an earlier date the computer goes back to what it was on that date. I maybe wrong, but I have a recollection that anything bought on iTunes can be downloaded again. Safest to check with Telephone Support first
The other way is that maybe Telephone Support can down load Lion for you again and then don't put the 10.7.4 update in