I use a TV card and composite to composite for having PAL in a scren in a TV program (superTV) for WHDLOAD games.
Not the best because not beautifull PAL.
I'm not using second scandoubler and PAL screen because no more place around my amiga for a PAL screen monitor.
Mediator is the best for having 16 bit WB and 8 mb of gfx card are available for the system.
I regret to not know if an hardware exist PAL of mother board to SVGA of the TV card (or better solution) for a better PAL signal with TVcard.
Mediator is best and I'm happy to continue to use an amiga
each day with this hardware.