acid/base. with plenty de-fats.
Use a powerful non-polar solvent to defat, xylene, toluene, or DCM would do fine. You could use naphtha, but you would need to defat many more times and it wouldn't be as effective.
From then you basify and extract with your non-polar solvent.
you can also try the dry sodium carbonate paste method. Make a crude extract with acetone and de-fat that.
A good method via the paste method, is to make your crude extract with acetone, and without de-fatting, precipitate fumarates straight out of the crude acetone extract using FASA.
This will leave you with crude fumarates that you can clean up accordingly. If necessary you could wash the furmates with a non-polar solvent, This method would be the easiest de-fatting IMO
(note: a better idea would be to use CaOH instead of carbonate, I don't know how well it will basify the alkaloids due to them being trapped within the waxy leaves, CaOH would do a much better and faster job.
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