the Probes may never be standardized but at least the 1/8" fosters connector is standard on most air fill connections, now if they could only standardize the thread pitch on those too.... it's a never ending menagerie for the consumer and finding something that fits your needs can be difficult, now more manufacturer are going with the Fosters fill ports, but that's mainly on new brand air guns, the older more established brands may not ever change to Fosters, but here's one way you can do it, just leave the probe in the gun, stick it in the gun and put a dab of hot glue or tape on the seam to keep it from falling out, now it's a Fosters fill port....
Worthy goal, but not sure it is realistic. For example, Foster fittings wear over time. I can't tell you how many fosters I've replaced, both during my Navy days on a submarine (EAB fittings) and on air tools that see a lot of disconnect/reconnect cycles. Then factor in my shore-duty role in a HPAir/HPHydraulic repair shop... I like the probes for my EdGuns and SPA guns, but honestly, I'm indifferent. RE: different tube pressures- no thank you. Costs for manufacturing/testing a "tank" or "tube" for 3k cost way less than 4.5k fill. Standardization is desirable, but I think it will also has the potential to stifle or limit innovation. Look at the preponderance of higher end airguns using discrete plenums now.