I would think there is but I don't know what specifically.
What I was thinking of was to simply take macro digital shots of the negs and then just invert those in what ever photo editing program you use.
They won't be especially good quality but may be good enough to help you decide which to print.
The slide copier attachments I remember from way back were made to use on SLR cameras and while there probably were some I don't recall seeing any for 120 film, the ones I remember were all for 35mm.
I'd think you could get a basic flat-bed scanner for about the same $ as a slide copier attachment and then just scan the negs and invert. Again, not great quality but, hopefully, enough to decide about printing.
This won't help you with the film you've already had processed but going forward, you might think about using Precision Camera.
They are one of our sponsors here at RFF and have a link on the main page with an offer of free developing with their high end scans. C-41 and E-6 only though. They do offer the scans with silver BW but I think there is an extra charge for that. Plus return shipping.
I am a very happy customer!
Good luck,
Rob