Hey man!
Sorry it's been a minute. Pulse weapons should be especially easy. What you can do is, from the original Sabre.py hardpoint in the KM src/hardpoints folder, just re-add the torpedo pulse weapon system and change it to use pulse phasers. This way you have standard beam phasers, pulse phasers, and torpedoes.
You should be relatively familiar with the process of adding properties to a ship hardpoint. When it comes to changing what pulse weapon fires from the pulse launchers, look for the following lines at the bottom of the pulse weapon properties:
PhotonTurret1.SetModuleName("Tactical.Projectiles.PhotonTorpedo3")
Change "PhotonTorpedo3" to "PulsePhaser" (that's what they're named in KM) and if you did everything right you'll have pulse weapons.