Randy & others,
If the water resistant linear fixtures are of great quality & in good enough shape ... I would not rule out doing something similar to what this guy did:
https://www.youtube.com/watch?v=-JAwS8nQ0Rs Under our overhang above one of our laundromat entrance doors we did this with a brighter quad LED strip than the guy used in the video & within our specific fixture encased with a lens cover is working out very well. We pre-fabbed on an aluminum strip & hopefully the aluminum will somewhat help in the heat sinking category. Instead of using connectors like he did we soldered the surface mount ends to connecting wires. There is some arithmetic involved to make sure the separate LED power supplies are calculated for the wattage etc. We had a lab grade soldering station already set up ... so that helped with the surface mount soldering. ]