Methods for cutting post finial...
I'm late to the conversation...Sorry about that, as you have probably already chosen a method that works for you?
If I have to cut many of them, and the project warrants it a...hand held band saw...(i.e. , Mafell, Oliver, Mikeska etc) is the fastest and most consistent method. This is more than likely outside the context of your project...
If I only have a few to cut, then I just use hand tools. Its pretty fast and actually faster and less cumbersome (if only cutting a few?) than "tooling up" to do it with power. I like direct and expedient woodworking with the simplest (often fastest?) methods. These often are traditional in nature, yet again outside (?perhaps?) the scope of what your wish to do?
The most common...go to...method that I know of, that is fast, and has decent results is to use a good jig saw and a long...new blade. Clean up with sanding method of choice. Most critical trick to this:
Good layout on all sides to be cut.
Clean single passing cutting technique.
Hot gluing (or other "tacking method") the scrap piece back on to work so reference surface for Jig Saw stays intact until final cut.