EIR colour is mapping infrared to the red portion of the image, red to the green portion of the image, and green to the blue portion of the image, blue light is filtered out and not used.
If you dont mind shooting on a tripod and taking 3 separate exposure, you could recombine this into something similar, you would need regular B&W pan film and infrared B&W film. 1 IR exposure with an IR filter on the IR film, one red exposure with a red filter on the B&W pan film, and one green exposure with a green filter on the B&W pan film (well either film really). If you can't change films easily between shots, then all on the IR film might be okay, dunno how close the red filter will come out to the IR filter though.
You would have to combine those later by scanning and digitally putting them into red (ir), green (red), and blue (green) channels respectively. You could also try printing them onto RA-4 back through colour filters filters added perhaps onto another filter made of unexposed and process C-41 film (or just fixed C-41 film), it would be a real PITA.
Washing after C-41 Developer
I also recommend a stop after developer if you intend to wash before the bleach. A straight up wash/rinse alters the negative quality depending on your water. At one place I lived it didn't seem to do anything, so I never noticed and got into the habit of just washing after developer. Another place I lived after that, all my negs came out fogged, I remixed every bath about 3 times from scratch before deciding to try a stop randomly to inspect the negs physically before bleaching, after I finished processing those, they came out very nice. So now I stop or I bleach.