Analog NTSC to RGB converter?

[Linards Ticmanis <ticmanis@gmx.de>]

Hello, do you maybe know whether there is such a thing as a purely
analog NTSC to RGB converter that one could purchase, either as a
complete device or at least as a kit or a ready-made PCB?

I found a schematic here:

http://www.seekic.com/circuit_diagram/A-D_D-A_Converter_Circuit/NTSC_TO_RGB_CONVERTER.html

but it is pretty complex and I don't know whether this doesn't exceed my
abilities. I've never laid out (or etched) PCBs myself, and I think this
schematic is beyond what one would reasonably build on a breadboard.
Plus, I'm really too lazy to build it.

The reason I'm asking is that I've recently got a Commodore 1084 monitor
in very good shape and it is really a great video monitor as such, even
80 characters per line text is really legible on it - but it is a PAL
model and thus useless for NTSC sources such as my Apple. It can sync to
60Hz without problems but of course it can't decode NTSC, so it will
display only black-and-white with the Apple.

Thanks for any hints.

-- 
Linards Ticmanis