Here’s a short review of an inexpensive SCART / RCA switch from Otaku-Games. It doesn’t have any of the options or enhancements of the gscartsw, but I think it might be a good start for people looking for an inexpensive option!
Otaku Switch: https://s.click.aliexpress.com/e/_DFxPTtd
SCART Switch Page: http://retrorgb.com/scartswitches.html