OK. Good.
EEPROM useful because it can be changed while sketch running. Got it.
Also - I'm just using the flashing LED as an annunciator for an alrarm condition.
Blinking draws attention better than steady state ON.
Overflow thus is not an issue for me.
Finally, Re Powers and Masking - I like that better than what I did.
Will use this instead.
The reason I was interested in a simpler way to flash the LED was just to avoid having to deal with the logic and curly brackets that go with a proper "blink without delay".
I can keep this line "in stock" now and paste it in the future when I need this functionality.
I'm 100% good to go now !
Thank you all.
Bob W