The mixed reports suggest to me, nah, probably not worth risking in combination with anything else really. For a start, there's no guarrentee you're going to have any kind of experience at all, judging by the reports, which begs the question why would you even bother, given the possibility of ineractions..?
I can't honestly advise any tripping unless the combo with Lithium has been explored or someone with considerably more pharmacological knowledge than I has given the go-ahead but
if you really intend a mild trip on a comparitively safe & gentle psychedelic, Al-Lad is your man. Not bk-2-cb. I don't like the idea of you doing 100mg of this stuff when a tiny 150ug dose of Al-Lad is not just safer, but much more likely to have an effect, & an enjoyable, survivable one, at that. The amount of material alone is a concern with the bk-2c-b. Just my opinion.
You could do worse than ask about the Lithium/bk-2-cb combo in this thread in PD -
http://www.bluelight.org/vb/threads/694585-The-Big-amp-Dandy-K-2C-B-Thread-Part-1