While I do not give myself a Buddhist Witch label, there was a time I incorporated Buddhist philosophy within my practice. Along with that I was using Chinese amulets, and incorporating feng shui elements within my practice. I still use much of feng shui within my practice.
Buddhist philosophy can be daunting for me. I absolutely love it, but can have difficulty implementing such things as right behaviour, speech, and thought.
I have utilized Buddhism in the past, but lean more these days towards practicing hedge witchcraft. I have been practicing shamanic techniques for such a long while that to leave them behind would be denying a large part of my personality and a larger part of my practice and path.
These days I work with Buddist philosophies less so.
Buddhist witchcraft certainly makes for an interesting dynamic.
At the basic level, Buddhism is about nihilism of the Self in favor of recognizing unity with the all. The idea is to stop being a drop of water among other drops that happen to form an ocean, but instead recognize that you are the ocean itself.
Meanwhile it seems that magical paths like wicca and other animist/shamanist paths is about building up the idea of Self and individual identity/authority. It is more of an 'I am here and this is my will' outlook.
From my experiences it sums up as basically a conflict of submission (Buddhism) contrasted with Assertion (Wicca/Witchcraft). This can be difficult to marry together unless you are an individual who finds wisdom in paradox. Some people are comfortable with it, others find it anathema.
In my travels I've picked up a slightly modified axiom that oddly represents, and also solves this riddle. Well, for me at least.
"Those who submit, rule." (The original that I know of being "He who submits, rules")