Yes, we are doing this now for my customer.
We have one REST Client step that does the login to grab the token.
We then pass that to a Modified Java Script Value that combines the Authorization Header with the token value.
This then passes to another REST Client step that calls the HPD:InterfaceCreate form.
I forgot to explain my environment, I have AR Server version: 9.0.00.002 201509100901 with Spoon 4.1. I don't have REST Client as a step.
Can I do the same step by a HTTP Post?