Might crash in the carrier, depending on how saturated it already is, and I'm pretty sure Matt had clumping issues with the first few batches, so I assume you would as well.
Adding liquid clen to topicals is very popular. Might get away with adding it to the bottle, but some just add it each time they pump some out.
If you're hellbent, then add a little at a time, put the bottle in a hot water bath and shake vigorously.