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iirc TeslaFi allows doors to be unlocked so you would just need access to a web browser (and probably fast legs to get back to the car before it locks again?)
if you can borrow someones phone do you need to phone anyone? if you know your password could you download the app log it in and unlock the car that way? (Not forgetting to log it out afterwards of course!)
id be much more comfortable calling a close friend or relative to do it.
Not sure what allowances you have before you set up the phone key and also not sure how happy i would be with someone downloading and doing all of that
I have a Key Card wallet with house keys on a key ring. Always in my pocket when out. Have needed the Key Card on the odd occasion when the car didn't recognise my phone.