From Class 2 to Class 1. How "hard" is it to switch?

[PCeBiker]

So either my shift interrupter isn't working or it's too slow

I think the whole idea of a shift sensor is wrong.
It's like having a shift sensor on the stick shift on my car to back off the throttle when I grab the shifter.
That would work on an automatic transmission but not on my 5-speed manual transmission.

The engine needs a bit of time to rev down before shifting or I'd grind the outta my gears.

I used to power-shift (no clutch) my motorcycle all the time but I wouldn't want a robot to back off the throttle for me.

I smoked the sychromesh gears for third gear on one of my cars and could only get into third gear by power shifting it.

It would take a few tries to get it into third gear, grinding the Living Snot out of it with every try, so I only used third gear to accelerate onto the highway.