If you're looking for an upswept curve from a panchromatic film that looks similar to IR820 I'm afraid you're just not gonna get it. Sure we can push films and overdevelop them but we're still not gonna get those glowing highlights you get with IR film, not to mention its very unique spectral sensitivity (vegetation goes white).

An upswept curve is something I've experimented with for quite a while. TMAX 400 pushed to 800 and developed in a speed increasing developer like Xtol 1:1 works ok, but lacks a bit too much shadow detail for me. Another combo that I've used to get a good upswept curve is Tri-x (TX, not TXP) in HC-110, especially pushed to EI 800.