@DaFlex that's running a 64-bit OS in a container (on 32-bit userspace) so not really a solution that works.
Could the opposite, a 32 bit container at 64 bit, work for us?
PS: It seems like it's possible:
We’ve created a sample project to demonstrate that for the first time ever, you can now install 64-bit balenaOS on the Raspberry Pi 4, and run a combination of both 32-bit and 64-bit containers together simultaneously; notably the exclusively 64-bit MongoDB image.
Due to the increased RAM usage probably only an option for RPi 4B.