rar the iso into small rars...
then file share all the itty bitty baby rars together.

then once ALL the rars have been successfully downloaded ..
unrarring or extracting the 1st rar "should" chain the rest into the complete iso.

It "shouldn't" work...
it is a given that it "will" work ...
as long as the process is done correctly.

I do suggest when rarring the distro into parts..use the "highest quality" compression option...
It will mean there will be more little rars ..but the overall file integrity will be bulletproof .

So to sum it up ...
rarring will keep the file integrity of whatever contained ...pristine and uncorrupted.
and it is a common thing to split a rar up into smaller rars.

I'd wish you good luck...but there isn't a need...no luck involved here