Many years ago more than 35 years or so any way I made a wheel carrier for my Landrover 101 Forward Control Radio Body. The tyres where huge 9.00x16 very tall and very heavy. I did not have a welder nor much ability in that direction but manage to fashion one out of Key Clamp Tubing and Joints. The radio body version was a rarity and mostly had spare tyres inside behind the passenger. The problem was taking all that weight and compensating for the different radii of the rear swing door and what the carrier would take. It as impossible to align the robust carrier hinges with the weaker door hinges. So I engineered an additional hinge close to the door mounting point.. the end result was a formidably strong swinging mount that swung along and with the opening and closing of the door. It was rattle free and safe. Of course eating ones spinach before lifting and dropping the spare was essential, the spare really was that heavy but it never failed. I was really proud of my engineering as no one else in the Land-Rover 101 Forward Control Registrar, had yet managed to come up with anything and just like on here, their where many far more advanced mechanically technical people than I. The vehicle is laid up on the property unmoved over the last 12++ years and it is still on there and did some a lot off road excursions some extreame.
Key Clamp, is very versatile and it might be possible to fashion something with a little bit of imagination. It would be far cheaper than a commercial product. I would have thought looking at the skill set on here that someone could manufacturer something out of box steel or tube and weld it all up with a jig to their own design.