This is serendipitous - I was just about to start a new thread to ask
pretty
much the same question: is it reasonable and acceptable to the
manufacturer, the regulator and insurers if I replace the pneumatic
tailwheel of my Ventus with a solid one?

My initial thought is that the loss of protection from impacts would be bad

for the structure, but then a solid tire can't be much worse than a solid
skid, can it? The only difference I can see is that the skid might spread
the
load, rather than transferring it through the axle mountings?