The UK CAA have been considering a common Transition Altitude since at least 1996, so it's nice to see them taking their time to get it right
6000' would be a good altitude to pick as it is alread in place in some major pieces of airspace in the UK.
I was also taught that Standard Pressure Setting = 1013.2HPa or 29.92", whereas the term QNE was the reading on the altimeter on touchdown when the Standard Pressure Setting was used (sometimes called the Landing Altimeter Setting).
This would tie in with the Radiotelegraphy decode for QNE which is:
What indication will my altimeter give on landing at ... (place) at ... hours, my sub-scale being set to 1013.2 millibars (29.92 inches)?