I've used the Biotuner along with EFT. Good results, the EFT helped me a bit more than the Biotuner though. The 7.83 hz setting #3 seemed to be the most relaxing for me. Your mileage may vary. As an energy worker I use several other modalities as well for anxiety relief, QT, QE, Reiki,etc.

EFT works fantastically well once you get the language/approach that works for you. Personally I'd spend more time drilling down deeper in your EFT practice, finding alternative approaches, etc than spending time and money on various devices.

Eft works very fast on certain things, and others take more time and multiple approaches. The most basic and important thing is to face your pain, fears, etc head on and really feel them strongly when you're tapping on them. And then tap on specific events/memories involving those pains/fears, and tap on other problems that you can think of that are related to the same pain/fears/anxieties.

It takes a bit of work sometimes, but your entire outlook and life will change once the emotional charge is taken out of fear, shame, anxieties etc and the memories that contain them.

Here are some other things to add to your list.

Amygdala Retraining
TAT
Bach Flower Essences (highly recommended)
Sedona Method
Meditation
Hypnotherapy
NLP
Metaphor Work
Energy Work ala Donna Eden