One of my all time favorite films was/is Kodak's aerial version of HIE, in 70mm. I still have about 100' of it left in the fridge. Unfortunately, when it is gone, there will be no more. I like to process it in MCM100, which gets rid of the rather rocky grain which HIE often exhibits. I shoot it through an optically flat hard plastic IR filter that I get from Edmund Scientific, 4x5 sheet of it is about $13. I prefer less infrared look rather than more, and this filter does the job just fine. The max effect seems kind of gimmicky to me.
Sean, I am sorry to have to confirm what you most likely already suspect. The favorite paper that you mentioned for printing IR, Ektalure G, is no more, since Kodak got out of the paper business. It was a paper that was widely used in portrait studios which could control their light and process uniformity making the unigrade practical. Since portrait studios have left analog, there would be very little market for it; I'm sure it is one of the products that Kodak dumped very early in their frenzy of discontinuances. I used it with Beers in two trays and found it very flexible. I've got about 50 sheets of it left. That's it.
I just remembered and checked Freestyles catalog. Bergger makes a single grade paper which might be worth trying:
Bergger Prestige Fine Art Supreme (SSFA).
I haven't tried it, so I can't pronounce upon it. If someone else has, I would like to know what you think of it.