Hi!
OK, a few things to try there... thanks for your help! I'll let you know how I get on.
EDIT: That worked really well. By that I mean, using Virtual CloneDrive (the method you described before this option would have worked just as well, I'm sure, but this was easier).
The only catch was that the Adobe installer wouldn't let me point to it to the next virtual drive along, but all I needed to do was mount the second ISO to the virtual drive that the first ISO was using... and voila! Very easy. Thanks again!