UTR sadly us procedural tower types still need the report... can't use ADSB/TSAD for separation.
As alluded, it's not too difficult to work out if you say left 4000 that you aren't headed... well who knows. Leaving or left both work for me
PS I am pretty sure there is a reference in AIP that you don't have to advise vacating a level when you are identified. I will look it up tomorrow at work if someone doesn't beat me to it
AIP ENR 1.1-16 8.4.3 Note is the bit about not needing to advise vacated when identified