Here I have a holder that you can attach to your L-bracket, for example, to attach equipment that would otherwise have to be attached to the hot shoe.

I tested it with different parts. For example, a remote shutter release or a large flash. In the latter case, however, the print quality and the material used should be appropriately good and designed for this.

I printed my part in PA-CF/ PETG with 4 perimeters and 40% infill.

Note: In the pictures the parts inserted into the adapter are just to show the function :D I myself don't have any suitable accessories myself, but I designed this adapter at the request of the community.