Hi Hans,
The standout cameras to meet your needs used to be the ZWO 290mc or ZWO 290mm, but now there is a new camera, the ZWO 462MC which has a QE of ~90% in the 800-1000 nm range. That is twice that of the QE of the 290mc according to ZWO here....
ZWO ASI 462mc
Interestingly, in the >800nm wavelength range the camera is effectively monochrome as seen in the graph below.
Best
JA