Well, first off I would start by asking here
About your question though the primary concerns are 1: finding something that’s the right size and 12S capable, the stormcore 60D+ is a good option but may have issues fitting in the enclosure. makerX DV6 is similar in size but a bit cheaper with fewer features.
2: you still need a BMS. Your vesc can handle low voltage cutoffs and ensure that you don’t over discharge your battery but without a BMS you’ll have no way of balancing the cells during charging. There are a ton of local people as well as people on this forum and locally who can swap out your BMS. It’s important to have a BMS
Also if you talk to @Yeahthatperson or @bboybowzer they’re both super invested in the local community and have tons of connections.