I found this:

https://www.ebikes.ca/product-info/cycle-satiator.html

.. looks expensive, but if I would need to buy a new charger, I would choose it because allows a lot of customizations.

By example my original charger will charge to 71.4V, so to maximum 4.2V/cell, which lowers the battery lifetime. I have to guess when to remove the charger to not charge at maximum, but sometimes I stop it at 80%, sometimes at 90%, sometimes over night it's charged at max. I would like better control.

Super Honda, I had the same issue, and blew a second charger as well. It's in the shop now, getting checked out, but I was able to charge through the external port on the bike itself. I did notice my connection on the battery was extremely loose and needed to be tightened down. I'm suspecting a bit that it's the shittier/older connection type that they've now replaced.