This guide will most likely work for any race mod.

In order to migrate from HAR Revia to Biotech Revia, just follow these steps:
- Install Character Editor
- Make sure there are only colonists on your map
- Make a backup save
- Anesthesize & strip all alien pawns
- Take note of their previous race
- Use character editor to reset their races to human
- Close the game
- Uninstall HAR, all alien race mods and mods that depend on HAR (You'll see this in RimPy)
- Install "Prosthetic No Missing Body Parts (Continued)" in order to fix the inevitably missing bodyparts
- Install the biotech version of your desired races
- Start the game
- Adjust xenotypes via dev mode until your pawns all have the right xenotypes (might take a few tries, remember to re-apply the sanguophage xenotype)
- Use Character Editor to fix all bionics on your pawns (remove missing body parts and bionics, re-apply the bionics to the correct bodyparts)

Everything works flawlessly in my save, I can also get Revia raids & caravans. They have the proper xenotype now.