I think the monster box has wiring for 2x6s, so maybe get your battery made as 2x6s 7p instead of 12s7p and than just use the wiring which comes with the box.
You can also easy charge through the xt90 and take the packs out.
I don’t use the monster box, but similar princip.
Just 2x6s made a xt90 serial plug and I charge the packs with an external bms.
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