Can you pay via Amex out of curiosity... the points would be great
Just got my delivery date given to me, it'll be in 12 days, woooooot! Finally.
I do have AMEX cc and at the moment I need 50,000 reward points to transfer to Finnair in order to have a seat upgrade on an upcoming long haul trip. I am still about 15,000 short.
So one way to do this is via Paypal's service called Xoom. There will be a fee. For a £15,000 transfer to a UK bank account the fee is £97.99. It is 0.65% (I've checked this as I initially put £20,000). That will give me 15,000 membership rewards point plus I have an annual bonus of 10,000 reward points which will be met if I made purchase of £15,000 (not sure how quickly this would be applied). So, a £15,000 transfer will give me 25,000 reward points for less than £100. If I looked at Finnair website, buying 15,000 points cost £193. So it's definitely a deal.
I'm only going to pay £15,000 as that will get me enough points in the immediate future for my Finnair, there's no need to incur further charges! The rest I will pay with bank transfer. My max daily limit is £25,000.
tl;dr... Yes, you can use your AMEX as part payment for your Tesla, I will use Paypal/Xoom but I understand Revolut/Western Union are other options. There will be a charge, but if you need your AMEX reward points for something specific and with a time limit, then it may be worth it!