Ways around box fill worries
I almost never run a feed to a light and continue to the next device.
I always run my feed to the switches and receptacles.
Feed switch 1, cable to light fixture, another cable to feed the next switch, and so on and so on.
Old boxes can be removed by cutting the nail with a hacksaw, pulling the box from the wall, or drop it into the wall.
Their are 2 types of old work boxes. One uses a set of wings to pull the box flat against the back of the sheetrock two uses screws mounted into the inside of the box that screws to the stud.
Both boxes have limitations for box fill, but both come in several sizes.
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"