I do not believe any of the issues we’ve discussed have changed at all in the last year. There are a lot of good suggestions above.
The sacrilege model would be to switch over to Filestash, which does not include built-in syncing on purpose and is super light weight. You would then mirror all of your storage between multiple locations via Syncthing.
Filed a request here tp see if the OCM-API has any future plans for development of Nextcloud Federation since it hasn’t been updated since 2017.