MPPT generally refers to solar charge controllers... if you want to use one of those, find one that is fully programmable like the Victron and you can customize your charge rate and voltage. Note that most are buck style so your input voltage will need to be higher than the battery.
If you want to use balance charger, then most will stop at 10s. That said, some dual channel units can support two banks of 10s each. So if you split the back (electrically) into two 6s packs for charging, you can charge both at the same time.
A dumb "wall wart" is also an option, but its the least desirable to me. That said, its also the most convenient provided you have a BMS.