Most of what I have read on ECF says to stay away from any of the oils since they might be bad for the lungs. Oil can't/won't be expelled?
As far as the extracts it sounds like they aren't as strong as the flavorings used by most DIY'ers so would dilute the nic strength of the juice.
So once again I guess the answer is 'it depends'
I figure that with the small amount of any of it that I would be getting I am willing to try most anything... so will probably try your mix one of these days....
Oil is in premixed juice from popular vendors.
Perhaps some people who fear oil are vaping oil and don't know.
Some chefs breath significant amounts of atomized oil; wonder if they have any documented oil related lung issues.