My effort to "maintain it" post DyonR halting his efforts is to provide the image with the current version of Qbt. If the small changes I made don't interest someone (aliases for easy exit and IP check, and binary for Oookla speedtest), they can always build themselves a new image from the DyonR sources on his github page. It's a one liner in the shell:
docker build --no-cache -t qbittorrentvpn:latest https://github.com/DyonR/docker-qbittorrentvpn.git
So long as this continues to work by pulling the latest Qbt sources from their project page and nothing in the build process breaks, anyone can do this themselves as long as their Linux or OMV is set up to compile code. I think that just means adding the build-essential package.
However, if anything in the image build process breaks, I doubt I would be able to fix it as I am not a coder. At that point I would freeze the effort with the last successful build and start looking elsewhere for a replacement.
I think you should attempt an image build from your github page, and if it works, why not keep going, continue to improve it, and offer it up?