I made this comment somewhere on the New55 blog, but it went unpublished. Could be from the lack of interest, could be it just ended in spam due to including a URL. I'm not going to chase it. As I had it copied to my notes, I'm going to publish it here. Here it goes:
Maybe it would make sense for you to offer a service like this (scroll to the Online Exposure section if the link doesn't open from there). What they do is that you can send them digital files, they make a Polaroid picture out of it and mail to you.
In your case people would send you their digital files too and you would make a New55 exposure of it, together with negative and positive, already fixed. This way you could:
* Add another (small, but possibly relevant - you sell T-shirts after all) source of revenue.
* Test your own film and let others pay for it :)
* Most importantly - attract more people to try the film. There're probably many people (including myself) who would like to see and handle the actual result, but don't have everything that's necessary to expose the film (from 4x5 camera to the specific Ilford fixer).
In your case you could add a good scan of the negative to the service. In addition you can always ask permission to publish the pictures on social media - the exposure will certainly be good for you and probably for the photographers too.
In case of SuperSense (who do the same for Polaroid) the exposure is made from iPad screen limiting the maximum resolution to 2048x1536px, but this, of course can be improved. It's probably not relevant for Polaroid, because of the low native resolution, but would certainly be good for New55. Why I'm so interested in this is because I'd like to have some silver gelatin prints made out of the negatives later and maybe, just maybe - if I'm happy with the results - try to sell some prints this way.