Since there is already a IR filter in the camera, it doesn't make much sense to add a second one.
What you want is a NEAR-IR filter like the Heliopan BLF 1x, LW -0 that starts to cut down at 780nm of wavelength.
Did a little test.
1. BMC stepped down,
2. Heliopan Vari ND @ max setting (ugh),
3. Heliopan VariND @ max setting + Heliopan BLF 1x, LW -0 on top of it.
Shot on ProRes with a redhead light.