Nah, you're not going to pick up any discernible noise from LEDs, especially in a power amp. The Chinese copies of the Bulgin switches I could get my hands on felt cheap, so I went with the real deal which necessitated the driver board due to using a momentary switch.
It was a fun place to work. I left in November of last year, shortly after it was sold.
Currently I'm a bit of a purist with my system - full range speakers, 300B amps, and no preamp aside from the phono stage. I prefer low light, no distractions, and listen with my eyes closed.
I've enjoyed every piece of gear and every step on my audio journey. I'm not sure where it'll ultimately go, but this stopover works well for me for now.