As I understand it the format is the same (or at least very similar) to an original 400k mac disk. I'm sure someone with a running Mac/Mac 512 could probably find a way to write a boot disk for you. (I don't happen to have one) I don' t know when 400k support became problematic for Macs.
(P.S. I could be completely wrong too but you had such a great find and no one seems to have helped in a productive way...)
Format is no problem.
I have enough old Macs to put it in every ever used Mac format.
Start up application is problem :-)
And dont worrie about getting helped.
Searching is part of the hobby.
london and Paris werent build on one day.
From memory, some of these are DART files - so you will need to find that Mac application to write the disks (I think it is somewhere in the same archive).