If this were actually credit-card-sized (i.e., literally fit in a credit card slot), had a smart card contact, and supported SGX, I'd be excited. Oh, well.
Are you using and/or developing for SGX? I looked into it and got put off by the need to deal with intel for licensing and signing keys, but I'd be curious to know if anyone is doing something interesting with it.
There is some work afoot to improve the licensing process. I will not develop for it under the current licensing regime.