OK. I am not answering any of your questions, but I am throwing out an idea in case you can use it.
I primarily use BW as a cloud-based PWM, and use Keepass as a backup, but I don’t use Keepass on mobile.
Almost always, BW is accessible, so I hardly ever touch Keepass. However, I do backups/exports of BW vault religiously. Whenever BW is unavailable, I just “create” an empty Keepass database, and import BW’s exported .json into Keepass, and I am in business. Keepass does import BW’s .json file natively, although I am not sure how completely it does the job, since I only sporadically use it. No syncing is required in my usecase, since my keepass DB is a snapshot of BW’s.