Yeah, the quality of brake light pressure switches is declining. I'm on my third one in ten years. Yes, if you are ready with the new one, you can swap it without bleeding. Some fluid will leak out, and bleeding is usually not needed.
I got rid of the trailer light thing a long time ago. I'm surprised Greg still uses them. Mine burned out on me a couple times. I use a bunch of Bosch-type relays and a single heavy duty 2 terminal flasher to run things. Changed it out for relays in 2010, not a single problem since.
It's just one of the things on a LONG list I've changed over the years, for the better.