Flashcarts are pretty much all I use anymore, they conserve space and are economically sensible while upholding the functionality of obsolete hardware without resorting to emulation and FPGA devices.

I do all my own modifications. Recently finished a total capacitor replacement on a PC Engine CD-ROM setup and gave it RGB output with a custom 3D printed side panel:

https://imgur.com/a/ZqxyXh2

Make my own scart cables, hack RGB scart into abandoned CRT consumer sets...

I suppose the pertinent question is do YOU undertake any tech/mod work, Greg2600?