there are other ways like in Malaysia, we have brewed beans that are suitable for drip coffee.
Actually the part of bullet proof coffee is that in Malaysia, in the capital city of the State of Perak, Ipoh, used to brew the coffee with grass fed butter (during the olden days) and people have been taking "bulletproof coffee" (kind of drink) in Ipoh for a long time... haha... except they didn't know they shouldn't add other things like sugar and condensed milk into it.
For me, I try to go coffee free once a week; just to let the body detox off excessive instant coffee since my coffee machine died on me. haha.