Typically use LH trigger finger own slide release. Most of my LH work assumes a damaged RH, having had my right in a cast several times. This has worked with 1911, Glocks 26,19,17, 20, 29, 21,30, HKs P2000SK, P30,HK45, USP45, MK23. I train also to rack slide on gear, belt etc...
If you are normally left handed slingshot works well.