pastels are can be tricky with NSTC or PAL. Not positive about pastels but I’ve defintely gotten some incredibly suprising and unlikely analog color distortion (pinks, yellows, golds, and neons) using the old Videffektor board.
without even diving into the broadcast gear world, pastel seems easiest to achieve via one of those cheapo consumer ‘enhancer’ units that has a chroma knob, which means u can desaturate everything.
most of the panasonic mixers have invididual channel saturation knobs as well in their color corrector section.
Sony FXE mixers have individual channel HSB and ‘color correction’ as well as really nice pixely pastel feedback
Panasonic mx70 has individual channel YpbpR controls along with satuarion/desaturation and can get Very Very weird with those zones