I was thinking today about changing to use GoPro cameras instead. You can connect these to the raspberry pi using an HDMI-CSI bridge (e.g. https://auvidea.com/b100-hdmi-to-csi-2-bridge/)

There's a video here about using GoPro Hero for computer vision with the raspberry pi:

And you can also remove the IR-filtered lens from the GoPro Hero 3 or 4 and replace it with a non-IR filtered for night-vision. As shown in this video:

The GoPro Hero 3 is around £130, whilst the Hero 4 is around £400. So this approach makes for more expense, but it's worth testing!