Personally speaking, I would make it "their problem". In other words, if they mess it up, it's on the, The labour cost is really worth it. I may be wrong, but I think the circuit board includes install. The CCS adapter is teak OEM so I wouldn't buy and "clone". You could also join TOCO (Tesla Owners Club of Ontario) and have access to borrow the CCS adapter for up to 2 wks at a time, as a member.
Jgdixon