Hi,
A lot would depend on the numer of users whowouldrequire, or make use of, a file format such as SER (especially since it is apparently a 'video' format).
That said, given that there are some sample code implementations available on the page that you linked to, and given that PixInsight offers users the ability to 'add' to the basic core either as a PJSR Scrip (akin to Javascript), or as a compiled module (written in a high-level language such as C) then 'anybody' could implement a means of examining an SER file within PixInsight.
Several years ago, I wanted to be able to debayer the CMYG images from the early Meade DSI cameras. Yes, I could do this outwith PixInsight, but I might easily have been in a minority of '1' as far asthis requirement being needed within PixInsight. So, I searched for, and found out 'how' to perform the GMYG debayer task, and then I learned how to write a script for PI.
Yes, it was a long struggle - but the end result was worth while. I had plenty of assistance from others more experienced in writing code for PI than I, so I included LOTS of comments throughout my code - to help others who might follow in my footsteps.
The script I created is still part of the standard PixInsight distribution - even though neither I nor, perhaps, anybody else will ever use it for its original purpose. However, it helped at least one other PixInsight user 'to have a go' - giving rise to a script that many, many PI users certainly do use on a regular basis - the Batch DeBayer Script.
So - perhpas your request is best channelled back to you, after all, who better is their to test the script and to make the adjustments needed to perfect its operation.
Remember, as an astroimager, part of our pleasure is 'solving problems' (from optical equipment, motorised mounts, PC control, weather prediction (!!), image acquisition, etc.) Image processing is just the 'end' of the whole process, and the satisfaction of knowing that 'you' were directly involved in making that final image. or video, is hard to beat.
Take up the challenge. Perhaps others here may have similar requirements to you, and may offer to help. Perhaps you have a friend or colleague who just likes solving 'software' or 'coding' issues (in the same way as you enjoy the astro-challenges).
Best of luck!