i would think it is better to get a rgb to svideo converter board for your genesis+32x.
one board can do many systems with a selecter box of some sort.
thats what i have now for my genesis+32x, neo-geo, duo, supergrafx i got it from massystems.com back 6+ years ago. they sold me every thing i needed.
i just bought the rgb to component/svideo/composite board from neo bitz from this forum.
but it does not work with the genesis.......

it works with the neogeo and duo..... dont know why not the genesis,32x, cdx or nomad.....