You would be better off getting a Hi 8 camcorder rather than an "8 mm to VHS" adaptor even if you could find one
( I thought that was only for VHS-C,( different tape) not 8mm TBH)
The other option is a Digital 8 camcorder which can play 8mm tapes
The Digital 8 has firewire output with which you can transfer the footage to a PC as digital.. then make a DVD
If you use an ordinary Hi 8 camcorder you will need an analogue to digital type box ( google "dazzle")
THIS
You dont have to buy new ( Cash converters ect) or you may even be able to borrow an unused one off someone
With either you can record to DVD via a settop DVD player, avoiding the PC