Since you're farming out the HT, your choice of steels are endless. Even your 1X30 grinder will grind most anything. You're right, the choice of 1084 steel is due to ease of HT'ing. You might try JT at
https://www.jarodtodd.com/ for HT'ing, and he has some steel available.
For SS you might consider AEB-L from Alpha Knife Works. They also have a full selection and have about the best prices around, AND you can order small orders without excessive shipping.