I was using WebP-lossless for quite a few years, for the subset of images I had that fit within WebP's limitations (being the 16383×16383 dimensions and 32 bpp color depth). I've recently converted everything to JPEG XL. Old JPEGs got losslessly transformed, and both PNGs and WebP-lossless into lossless JPEG XL.

Seems to be a similar level of "works everywhere" for me, with the exception of web browsers this time.