Just found out that Innovative Arms offers a service where they will machine dovetails in the slide of your LCP(LCP, LCP II, Taurus TCP, and Keltec P3AT and P32) for night sights. It pretty affordable too. About the same price as replacing sights with night sights on any other pistol. It looks like they aren't taking any more work orders until June but I think I'm gonna have it done to my LCP II once they start taking more work orders.
https://www.innovativearms.com/portfolio/sight-upgrade/
https://www.innovativearms.com/portfolio/sight-upgrade/