If you can measure how far away from the gas block shoulder the pin cut is, someone can measure a LPGB for you and tell you how the spacing will match up. Looking at a pic of the gun, a LPGB will be much shorter than what you have on there, so you really only need to be worried about the one pin cut, the forward one will not be covered by a new gas block (unless you get one specifically made to do that).
Also, you won’t be able to “match” a new pinned GB to the holes that are already there, it’ll require a new gas block drilled to your barrel, with potentially oversized pins if the pin hole will overlap your already existing holes.
As for a clamp-on LPGB, it may or may not fit. I have no experience with that handguard, so I can’t say one way or the other.