Have you ever done a light reversal step by holding a 1000W spotlight over the reels ? That’s not scaring but somehow magic… After the first wash / better if the Film is in the CD, light does not matter anymore. It is safe.
The color developing time will be unchanged 6 minutes; no need to shorten this in tray processing.The first developer time may need slight adoption due other agitation. Take a picture of a precise metered Grey step pattern and compare the result with the desired, than change FD time. Standard FD time (6:15-6:30) will be very close/will nail it, if temperature and agitation are in limits. 2 minutes more equals push 1, 2 minutes less equals pull1. Deviate in 20-30sec. increments (45 sec= 1/3 aperture) in the desired direction to nail your process.
This is a Kodak link but quite useful Look at page 9.