You're asking a lot from a start-up company launching their first product. 5 years is plenty of time for this to become supported by LineageOS/etc.
> 5 years is plenty of time for this to become supported by LineageOS/etc.
I don’t think that’s guaranteed for a niche product. We don’t even know whether this device is locked down in some way.
A, possibly easier, alternative for escrow could be for them to open up the device now.