What about 25 iso film from Ilford? The marked for it it's bigger than for IR, see how popular is Adox CHS 25 (Efke 25), many photograhers love it and buy it, including me. There are not many 25iso emulsions to choose, now Efke/Adox 25 is gone! Make please classic 25iso emulsion and I believe you will have many orders.
Then produce it in sheets, LF & ULF. Like its got a snowballs chance in h***.
Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand