What, exactly, sounds inaccessible about tap and hold? It's the exact
same concept used in the K2, KX1, and (dare I say) the BookCourier and
BookPort. If it turns out there are insurmountable accessibility
problems with the K3 (which I doubt will come to pass), putting
secondary functions on a button, accessed by a longer hold of the
button, won't be one of them.
Buddy, KB5ELV