I've been using an IODD 2531 enclosure for many years now, and it's doing pretty much exactly that. It works with any ISO I throw at it and has no issues with Secure Boot. It’s also platform-agnostic as it acts as a USB optical disk drive.
There are some shortcomings, like a bug where it doesn't remember the last selected ISO if its filename is too long, files also need to be fully sequential. These might be fixed in their newer models (the 2531 is fairly old).
There are some shortcomings, like a bug where it doesn't remember the last selected ISO if its filename is too long, files also need to be fully sequential. These might be fixed in their newer models (the 2531 is fairly old).