I've been thinking about making one (by using the rear seat base with some checker plate) but now a purpose made one exists It is however somewhat expensive!
https://www.ebay.co.uk/itm/SW-Motec...cle-Yamaha-MT-07-14-Moto-Cage-15/163859052828
Maybe there are other ideas out there in Tosser Land
https://www.ebay.co.uk/itm/SW-Motec...cle-Yamaha-MT-07-14-Moto-Cage-15/163859052828
Maybe there are other ideas out there in Tosser Land