Use the gyro
Do install the gyro. The 450 gyro has been discontinued. The 460 is the new sport Tail-Lock gyro from JR and will work fine in the BobCat. When you install it just set it to Rate mode. You do not want the Tail-lock feature.
There may be other gyro's suitable for the BobCat rudders, but you do want one with controllable gain. You do not need much gyro sensitivity when the gear are up, just when the gear are down. A better description is available in my BobCat Trimming article on BVM's website.