Just because you cant jail 3x 214 fbrc blockstrings after a hit teleport anymore does not mean the fbrc pressure is useless. There are still mindgames that come into play with the fbrcs that you can apply to create some decent pressure. Realistically his strategy is not all that different than it was before the nerf, you just don't get 3 free blockstrings that jail after hitting a combo (which, LBSH was pretty broken). You still have things you can mix up with fbrc pressure or throws such as b1, b12, 21, f3, b3 etc. Although the fbrcs dont always jail that does not mean they are not good. For example, if you go for 21, fbrc after a combo/vortex setup yes, your opponent can poke you out of it, but if you think they will poke you can just finish the whole string instead and 214 them into a full combo. Just because pressure does not jail and can be poked out of on a guess/read does not mean it is automatically useless.
You still have your overhead/low mixups (F2, B3, F4). You still have EX teleport which is one of the best anti zoning tools in the game. You still have jump 3 which beats almost anything in the air and on hit it gives you a full combo into standing reset. You still have flame aura which is a great anti air and also great since it allows you to get additional chip in your post combo pressure. You get the actual move hellfire as well which although it is risky it can make people want to jump which is usually a good situation when you are playing scorpion since you have a great d2, flame aura, and can also win most air to airs with j3.
IMO Hellfire plays the most similar to MK9 scorpion in that he is the most "high risk/high reward" version of the character. He gets big damage off of his riskier things or he can play safer and nickel and dime you with throws/tick throws. He is highly momentum based as well because every combo ends in a standing reset with scorpion at +18 right in your face.
If you are really concerned about controlling space in the neutral more effectively you might want to switch to Ninjutsu instead since that is more that variation's forte with his F2 range.
I still think the fbrc pressure is good, I am sure this is actually how NRS intended it to work (you don't get to just mindlessly loop jailed blockstrings, you have to make reads/guesses/mix it up for it to be effective.