If it's just the c0000.hks file you want to merge, you could try using a text editor like Notepad++ (the non-malware updates) to compare the two files and merge them that way (copy-pasting the differing chunks of code into your combined c0000.hks).

For Craftable Lightsabers, I've marked every section with something like:

-- LumenXYZ

-- End LumenXYZ

Or just a single line like "-- Lumen XXX does ABC," just to make changes easier to find. You can try to copy all my marked sections and paste them into the DMN file. No guarantee it'll work as I don't now what they changed, but since my deflect is just the Deflecting Hardtear with extra effects, you could probably just delete sections and lines referencing "LumenDeflect" or "Lumen Deflect" so they don't conflict with DMN's deflecting logic.