I had some time on my hands recently and I used it to figure out how to use my SB-800 flash wirelessly with my mirrorless camera
https://www.krishphoto.com/working-a-nikon-sb-800-flash-wireless-with-the-nikon-z50/ (https://www.krishphoto.com/working-a-nikon-sb-800-flash-wireless-with-the-nikon-z50/)
Use any optical slave flash with any popup or any on camera flash ! No brand restrictions !
While on the topic of flash, this one from Godox looks really nice retro the Lux Cadet !
https://www.godox.com/product-a/Lux-Cadet.html (https://www.godox.com/product-a/Lux-Cadet.html)
Comments appreciated !