Air Taxi First Officer reported a GPWS sink rate alert resulted in a CFTT event due to terrain factor landing runway 26 to RNO. First officer stated when wind dictates; not enough vertical guidance is available to this runway; especially at night.

Narrative

Due to the high winds and strong gusts; we took runway 26 at Reno for landing. The crosswind on the other runways were over the limits of the aircraft. Wind 280/24 G35. Upon turning right base to runway 26; we established a climb in order to have enough altitude for a safer height above the terrain as well as allow for a stabilized approach to runway 26. The approach to runway 26 brings you over a small mountain. We were at 6000 and climbed up to about 8000. After passing the mountain and starting our descent for landing; it seemed that we needed more of a descent rate and Capt disconnected auto pilot. I believe the initial lowering of the nose caused an excessive descent rate which is when we received the GPWS Sink rate; pull up. It was momentary and cleared once the rate of descent was again changed. The approach was now stabilizing. I believe the wind also played a factor in this as it was pretty strong. Approach continued without any issues to a safe landing. Suggestions: I believe using this runway at night is not a great idea. There are no published approaches for this runway as well. I never felt that we were in any danger with being able to see clearly during the day. I should have called go-around when we received the warnings but I could see that we were clear and it was corrected by captain immediately.