Managed to get the scart splitter to work with a monster cable. Apparently my pal Xbox gives NTSC 4.43 signal according to the red little light in my PVM 1440qm lol : r/crtgaming
CABLE EUROCONECTOR MACHO MACHO 5M PROFESIONAL
CABLE MONSTER RCA A RCA ROJO BLANCO AMARILLO 4 METROS DE LARGO MÁS ALTA CALIDAD MEJOR PRI 50644302633 | eBay
Monster Cable 00120277 cable EUROCONECTOR 2 m SCART (21-pin) Blanco - Cables EUROCONECTORES (2 m, SCART (21-pin), SCART (21-pin), Blanco, Male connector/Male connector) : Amazon.es: Electrónica
Monster Video SCART - SCART Cable - 1m - Laptops Direct