I don't suppose for a minute that anyone is interested in this, but just in case you are then read on.
I have a buddy back home in the States that used to be a lens designer for a very prominent company and now he produces specialist bespoke lenses to order. Needless to say they are expensive if you don't know him.

Anyway a time or two back I approached him on knocking up a couple of auxiliary lenses for my RX10M4 which he did. One being a Macro attachment that can get me as close as 2-1 (twice life size) with the basic lens set at approximately 90mm, It will go closer than that but the working distance then becomes unacceptably close. With the basic lens set to at approximately 200mm it produces an image of 1-1 (life size) with no vignetting at either of those magnifications.
The other lens that I asked him to knock up for me is a Wide Angle attachment which can get me an equivalent angle of view down to approximately 15mm in FF terms with the basic lens set to approximately 50mm. It will go wider than that but distortions start to set in at about the 40mm setting which to me is unacceptable.
In both cases these screw on adapter lenses are extremely good optically and its very difficult to see any drop in sharpness quality from the basic lens. I had to make & machine the mounts for these lenses to screw them onto my camera but as there is no mechanical parts to worry about the task was pretty easy.
So what we have here is a Macro attachment that can be worked comfortably down to twice life size and a Wide Angle Attachment that can give me comfortably from 15mm FF equivalent right up to 600mm FF equivalent with one Bridge Camera and a couple of screw on attachments.
Results will eventually find their way on to this thread in the near future.