Why would you not use the iso, then?
What it sounds like you're asking for would be for someone to download the iso and convert it into MKV format so you can convert it back to a blu-ray iso format. Is it a matter of not being able to add subs to the blu-ray easily? Still seems like the best option would be to use the corrected iso and play with that, rather than have someone make a new 20 gig upload for you.