To answer the original question, J&C (forum sponsors) sell Kodak Imagelink HQ film in 35 mm cassettes; it's the nearest thing to Tech Pan I'm aware of in current production. They also have Agfa Copex and an ADOX branded product (the latter much cheaper), all with similar characteristics. All use the same kinds of low-contrast developers that Tech Pan calls for, and all can also be processed in high dilution, low agitation solutions of HC-110 or Rodinal, or in my own Caffenol LC+C. I haven't tried Technidol or the dedicated developers sold for these products by J&C, but I have tried Imagelink HQ in Caffenol LC (before I added the ascorbic acid) and Copex Rapid in both Caffenol LC and LC+C, as well as the ADOX CMS 20 in Caffenol LC+C -- of that lot, I like Copex Rapid in LC+C best, followed closely by ADOX CMS 20 in LC+C (the Copex Rapid is about 1 to 1 2/3 stop faster and otherwise almost indistinguishable).
Honestly, unless you have an application where the extended red sensitivity of Tech Pan is a critical part of its appeal, the only loss I really see is the 120 format. Imagelink is available in both 35 mm and 4x5 (recut from microfiche sized stock), Copex in 35 mm and sheets that could be recut, but haven't been commercially offered that way, and CMS 20 comes in 35 mm cassettes. All excellent films with resolution that can easily exceed the capability of 99% of the lenses in use, none so expensive they necessarily have to be reserved for special applications, and all readily available in at least some common formats.