If your battery was split in 2x6s, you could use a Toolkitrc dual 6s charger:
https://www.aliexpress.us/item/3256804137187379.html
Price with power supply: 53usd or 73€ + shipping (to compare to 200+usd for an iCharger x12)
This is how @Etiennebzh charges, two simultaneous 6s packs but could be a single 12s pack with 2x(6+1) balance wire connectors
