Adding flavor to tablets

Hello,

Just curious if anyone has a good idea for tips on flavoring tablets/bars.  I am experimenting with freeze dried powders, and that works OK.

Also keen to find out some methods for making the batches for molding - using a bowl, the chocolate gets too cool too quickly - looking to be able to make around 20 molds at a time (so about 100 bars) and I am not sure I want to use a melting tank full of flavored chocolate...any other method I haven't thought of?

Cheers, Stu