I have just used the standard HDS clips and have found no need for modification. For true water-tightness', make sure you change out the O-rings. It is very easy just getting the supplies takes a bit of effort. I do have one rotary to bezel clip conversion with stock O-rings and it has been fine as an indoor nonenvironmentally challenged light. I am in no way recommending this, but it is possible short term until the proper o rings arrive.
I gave it a try for 2 days.. I carry my light in my left pocket with my phone. Without clip I don't like that I can't get the light with my right hand if my left is not free and that it usually sits beneath the phone or against the phone screen making the light getting out a bit of a nuisance.
I plan on trying it without clip first. Then using an extra Olight clip I have. If neither of those are working, then may need to look at the other options. Sure would be nice if it worked just floating in the pocket, just don’t think I’ll care for it.