The angle of the bottles i think would help combat the force. I can definitely see that its being mixed when i stop it, there is all kinds of nasty bubbles/foam rising to the top.I think the Centrifugal force created will make it so not much mixing is happening.
BTW alcohol will evaporate at room temp so no need to heat it up, probably doing more harm to your juice at that temp anyway, I would imagine. And unless you have the cap off no alcohol will evaporate. Not sure if you were thinking of heating it while you "mixed" it or not.
I am so glad the vast majority of my recipes are shake-n-vape...
Im a mechanic I use air and power tools all day, So I have that safety aspect covered. Im not a fan of a microwave method at all. I usually just hot water bath and shake by hand. But I was bored with a slow time at work and just through this together.There all interesting methods and reasonably safe as long as your careful with power tools. I prefer the more common methods of mixing my base and flavoring using cylinders and syringes to measure then shaking and vaping and if nessessary steeping in warm water using an ultrasonic cleaner. The one that scares me the most are the people that steep in a microwave. I've already herd of several people getting scalded by a super heated mix as well as bottles bursting. So if your going to get creative please think it through carefully. In my opinion the safer method is always the better method.