Did you check and see if one is available to order? Tesla has a set of plug adapters for various outlets. The magic box on the charging cable detects the plug and sets rate accordingly.
The 20A plug is handy to have for travel. One more option in the toolbox in a pinch.
I added a 240V 50A circuit with a 6-50 outlet to my garage. Cost was about $250 in materials. Labor was DIY. I get 25mph charging rate, which is fast enough to fully charge overnight under all circumstances.
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