Are you worried it's going to fall apart due to stress? I run mine at about 70ipm per edge. Works great on pine.
If you don't need the point detail, I found that this Amana bit has a down-sheer angle.
https://www.amazon.com/Amana-Tool-RC-45716-Composite-Alucobond/dp/B0112T8LQW/ref=pd_bxgy_sccl_1/145-3145806-6231005?pd_rd_w=AqVeq&th=1
Works great for flat bottom sign lettering, especially if you're using adhesive masking. I made a batch of signs using the Lowe's rough surfaced cypress and the masking didn't peel due to the angle.