Does it need to be a spiral? What is the cutter diameter? 1/8" shank 30º engraving tools are readily available from a number of places in the US.

https://www.amazon.com/SainSmart-Genmitsu-Engraving-Degree-Conical/dp/B07P99F3L1/ref=sr_1_6?dchild=1&keywords=30+degree+v+bit&qid=1614105818&sr=8-6