Yeah, but if it measures every 1 gram at 0.98 gram, it will display less in the end

This might be compatible. As the pass band should be wide enough to be in the same range stil.

The new ones are actually reaaaaly fast with booting

Especially since their models ditched the camera for “structured light” whatever it might mean.

For point 4. Newer devices are very clever and will auto switch when music is playing and of course both devices are turned on.