For etching plastics the best option is the M.C. Etcher:
In addition to the 60 and 90 degree V tooling we sell, we do have a couple of Amana packs which have a 30 degree V endmill such as:
while it’s defined as an engraver in Carbide Create:
I have had good luck defining it as a V endmill:
(but please verify and test the feeds and speeds in the material you are cutting — the tip is quite delicate)
and the other tools I’ve used quite a bit are:
(the Amana #46202-K .25" 2 flute down-cut is quite similar, just with a slightly different tool geometry and nifty coating)
and the 1/8" downcut #46200-K .125" 2 flute down-cut