I would like to know too. I have a frankincense resinoid from De Hekserij which acts as a base note but the odor isn't very rich, at least to my nose. Long lasting, but very subtle. It is 50% in DPG, so I don't know, maybe that depresses the odor a bit?
I believe there is also a frankincense / cedarwood co-extracted absolute which might be useful, White Lotus Aromatics sell it, not sure who else.