Kam'lanaut FR time is so insanely powerful if set up properly that he can very comfortably kill BFA in one BT mode starting from Phase 1. This allows you to skip every single enemy attack in the stage.
Timestamp
Party setup at 7:38
Note: I did not use the Kurasame LDCA
Kam'lanaut FR is mandatory. If his BT is not maxed you can replace Seymour LDCA with Shantoto LDCA and just skip Kam'lanaut's BT+ move. You do need minimum 0/3 realized BT for him though. Raines LDCA is mandatory. Kam'lanaut has a 1/5 UW.
Penelo can be potentially swapped with any other force gauge charger such as Ignis. Seymour LDCA can be swapped with any other call that lands a HP damage up debuff
Cissnei has 5/5 UW. Call doesn't matter. I did not use it.
0:00 Setup
Reset until Kam goes first. Use Raines base call targeting Penelo. Then AA and BT+
1:06 Penelo twirling time
Dance until FR is 100%. Then swap for Garnet, use BT+, then AA then summon
2:44 Summon Mode
Use FR on Kam's turn, and position so that he acts first after summon
4:56 Kam BT Mode
Use Raines LDCA right before entering BT mode. make sure not to drop BFA to 1% otherwise you'd die from Jecht bomber+