In the 1970's and 1980's, I leased USM Hytronic Clicker Presses to die cut vinyl sheeting.
Clicker Presses are used extensively in the Shoe industry and would be excellent for clicking holster blanks. As mentioned, they are expensive. I’m guessing that a decent used Clicker press is probably in the $5000 range. A new one in the 1970’s was around $2800. They are also very heavy and require a study floor along with being difficult to put in a basement.
There are two types of dies, forged steel and steel rule. Steel rule dies are for short runs and do not hold up. I'm guessing that a forged steel die for a holster could be in the $300 to $500 range depending on the complexity. I used to buy forged steel clicker dies from a company called Ontario Die
https://www.odctooling.com/Cutting-Dies.htm I'm going to contact them and try to get a quote on a forged steel holster die.
In my humble opinion, you would need very high volume to justify using a Clicker press.