The majority of hybrid efficiency comes from basic stuff - aerodynamics and the ability to switch off the ICE at will.
Gains in electrical efficiency will only result in incremental gains on a non-plug in hybrid.
No doubt financially your best option is repairing what you have.
The error code may not be the kiss of death though, I'm sure someone with Honda experience on here will tell us if it can be resolved with battery balancing or the like soon.
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