I'm aware that the laserdisc signal is composite, and RGB output is a "constructed" signal, but I'm open to any solution... sometimes, old technology is better than newer, who knows!

Still looking for "the perfect comb filter", in particular for PAL signal; a Snell&Wilcox TBS-185 could be a very good candidate, but I've found some of them only in US, and shipping price could be almost more than the device price itself... (**n)

...and still waiting to know further info about the phase-inversion trick; if it will work, it will be possible to obtain a dot-crawl free image with just a good capture card (with a bad comb filter too) and two capture stages.