I would use one of these two approaches: either double each cell and build a single, double-capacity battery, with one BMS, etc.
Or, build two completely separate batteries, each with their own BMS, meters, etc.
And only run off of one battery at a time, never parallel them.
Upsides of the latter are the redundancy/failover you're interested it.
Downsides are that you're pulling at a higher C Rate, and most likely will use more Depth Of Discharge.
And of course the extra BMS/etc. overhead.
I've seen battery combiners for Ebike batteries that are basically a pair of diodes.
Eliminates any current flow between batteries while still allowing flow to the load from either battery.
Current levels for our use case are much higher than for Ebikes, so the diodes would need to be big, and probably expensive.
And they could get hot due to voltage drop, thus wasting energy. And are another potential point of failure.
https://www.electromotivemods.com/shop/p/s1fmuuaawo86hdw5gduhknspnoks37
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