I've seen some exogenous ketones products, e.g. [1]. Could these help to get into ketosis without the nasty side-effects?
[1] https://www.amazon.com/KetoSports-KetoCaNa-Original-Exogenou...
[1] https://www.amazon.com/KetoSports-KetoCaNa-Original-Exogenou...
http://fourhourworkweek.com/2015/11/03/dominic-dagostino/ http://fourhourworkweek.com/2016/07/06/dom-dagostino-part-2/