Welcome Hannes
I think mild hybrid systems offer the most bang for the buck. Kind of surprised we don't see much more of them now.
I think the way to go is to go with a higher voltage alternator which would also serve as a starter/engine assist. And don't get carried away with battery capacity. I think a Nimh pack of the same weight (or less) as the lead acid battery would work fine. Not sure if Li batteries offer enough of an advantage to offset their price.
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