Oh so disappointed I only found this thread now! It is overdue, as it has been such a long time since the last one
Just as an aside, I believe it is not a requirement to make a departure call on the ctaf, as per the AIP. My company manual does stipulate though that a departure call should be made when turning contrary to the circuit direction and it actually includes the phrase "climbing to flight levels"
And let's face it, anyone who cares what flight level we are "climbing to" will hear it in the full departure report we make on the area frequency shortly after.