i've heard that too about the yellowing of white handles. both on riv's and on vettes (probably quite a few late 90's gm cars w/painted handles). luckily mine look perfectly fine still. maybe it was only on the pure white colors, not the bright white diamond tri-coat.
but to get back on subject, i have seen at least 2 rivs with chrome door handels on cardomain. if i recall one guy had them diped, while the other cut out "chrome" stickers to go over the top part. i would get a used set and send them off to be chromed. it will look much more professional than a DIY.
1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black -daily