Has anyone here travelled to North America (USA or Canada) while still ON the Sex Register but ticking "no" to convictions?

I've looked at the various sub threads but oddly enough can't find a clear instance of this.

Has anybody done this and if so what were the circumstances (how closely were you being monitored and how highly rated as a risk) and what was the result?

I already pinned my colours to the mast by ticking "no" to convictions for Canada ETA, and cops visit me 2x per year -- don't treat me with suspicion.
My excuse is that my conviction itself is spent, so force of habit: I treated the ETA like an employment application.
The ETA is successful as of now - I am allowed to enter.
I am off the register in August anyway.

My thinking is, a discrepancy between ETA and reality might be highlighted by a Green Notice if there is one. But I don't know that here will be one.

In my recent travels to Europe I was waved through, very quickly as if there was no notice to get the guards' attention, although earlier in 2018 (before Brexit and also perhaps when I was higher risk and newer to the register) they took a long hard lingering look at the screen after scanning my passport.