Hi Chris, have you matched the neg, or do you have an EDL that you need to pull off the lab rolls? Ideally a cheap scan, and and a digital grade is the obvious way t go here- then you can render a DPX sequence for the filmout. How much footage have you got? A DI grade in downtime ina decent system like baselight is going to allow you teh control you desire.
I would look to do a DI finish for best results. going to 35mm off std def tape is going to be a dissapointing experience, particularly given that you originated on film...
of course I realise cost is the killer here...
Good luck
Graham
London