New Version, Old Render Solutions... Or How to roll back to 4.16 render realisation?

Please tell me in which direction I should move. I need the implementation of LPV from version 4.16 for 4.27. As far as I know, LPV in later versions of UE stopped working as before due to changes in the engine core. Question: How difficult and feasible is it to roll back the LPV changes? I have successfully recompiled and replaced the LPV Plugin from 4.16 for 4.27, but it has not made any changes. I am also considering an alternative option with the transition of the project to 4.16, however, in this case I will need the implementation of rect light, which is not available in 4.16… And also Power IK, which seems to me to be an even more difficult task to adapt to the old 4.16. Perhaps I can replace the engine files responsible for rendering with files from 4.16 and fix the errors in some way? I don’t know…
P.S. Maybe LPV was fixed in the latest fixes 4.27 on GitHub?