North-Central Illinois Custom Kydex has the P89 listed in their drop down window on their website:
nickydex.com
I take that to mean that they have the pattern.
They have left and right, and a lot of options, and a little note that says they are mode to order.
I have a couple others bookmarked as sounding like they are open to do custom work:
Dara Holster:
Our Light bearing OWB Holster is made for over 300 WML configurations. Made from rigid .093" Boltaron and precisely molded to your exact firearm for a perfect fit. Adjustable retention and fit testing before shipment ensures a perfect fit every time. Shop now!
www.daraholsters.com
T5 Custom Kydex:
Get the most out of your T5 holster! We offer expert tips, cleaning instructions, and accessories. Find everything you need to optimize your carry setup.
t5customkydex.com
There are holster molds (blue plastic 3d models) available for the P89, and several others in the P Series, for around $50. Kydex looks like it is vacuum formed. If you find a company willing to do custom work, but short a pattern to use, the cost of the holster mold and postage would solve that problem.