Still hard to make out what is going on in the photo of the jig. Maybe..., the inner ring that clamps the router body is connected to the outer top ring by 2 pins/shafts across from each other, a bowl or round nose sign bit, tilt the top of the router forward and back to swing the bit in an arc. The bottom aluminum ring turns in the outer light colored ring to go all the way around.
It is a cool idea, jig and ability. I mostly make stuff for cats, I don't see myself needing the jig. I can't tell if the jig in your photo is manufactured, if DIY it'd take good metal working ability. The DIY wood versions in the photos look well with your skills. If there are some tracks in the work piece from play in the jig that's what sanding is for.
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