I believe that once a wallet is containerised it will run on any version of Linux that has docker installed - the complexity will be containerising, got to decorate/renovate 4 rooms in the house before I'll be allowed to complete an IT project, so I'll have plenty of time to think about it =)
The binaries inside the container are still architecture specific so would need rebuilding, however if you choose the right base it shouldn't be hard to rebuild for a new platform. I started doing some of this looking at how to distribute the solar staker web interface.