I definitely agree with the latter point: if you try something and it is "in ruins" you are unlikely to respond with any feedback at all. That is one of the things that Apple needs to do a better job at during their betas: I have personally often just written them off until beta 4 or 5 as "it is so unlikely to work anyway" (although I do try to pick it up once they stop doing rapid cycles).
However, for your ability to test in the future: the only thing I believe the iOS beta requires related to owning a Mac is that the downloads from Apple's website for the IPSW files are stored inside of disk image files; you only need access to a Mac long enough to restore your device, but I am not certain why you would need a Mac to work with it later. (I would love to be told I was wrong there, however, so I could add that to the list of endemic issues leading to this.)