Honestly, it may not be worth it. Kerbalism significantly changes how science works. There is no transmission of unmanned experiments you have already completed, for example. This will mean it does not play well with your pack, as I am finding out.
It's a shame because both are great add-ons.
AFAIK, Kerbalism also changes the science defs for nearly everything, but there is only one BDB experiment where the experiment ID is changed. For what it is worth.