Well, if the switches were normally closed and opened at limit - then yea, a latching relay with the limit switch in the coil's loop would do it. But the Crossfire's OEM limit switches are OPEN until the limit is reached and close at limit.

Hey........... if you used a conventional relay and made it latching using a pass transistor, a switch transistor and two resistors, you could energize the relay with the up/down switch - and unbias the transistor with the limit switch. Total parts count of four transistors, eight resistors, two relays.