The only way to get these is to buy and scan Vol.1. There are plenty of physical copies still on sale, we just can't waste another $25 for that. Like you said, maybe someone'll do that one day, just not us :vThank you great hero for continuing this work.
And any fellow fans out there, if you happen to have the scans of the Volume 1 Extras (cover, table of contents, etc) can you gloriously post??? I get that this is a rare and hard to find series, so it might be impossible.... but if you can, this is a request for anyone put on the net to find it... so maybe someday, it'd be found...