I think it is awesome you want to create a mindfulness practice informed by secular western developments. If you have a chance to participate in a (genuine) shamanic ceremony, your philosophical training will bring a lot to the experience. (There is a mind-to-mind phenomena you can observe in vipassana retreats or in shamanic ceremonies; the content of your mind doesn't just inform your experience, it also affects the collective. So when you bring your Western secular experience into the mix, it brings a, in my opinion, vital perspective into the experience).
I suggest that there is a allergy/aversion to religious traditions that should be investigated by a meditator at some point. Likewise, there are aversions to secular methods as well that needs to be investigated.