Special Fake Meetme Channel for playing / recording/ DTMF

Is it possible to use Asterisk to create a fake call (1), which can be attached to a meetme (2), AND which can then use RTP or something else to stream a file into the meetme (i.e. use it as a sound player in a meetme), or record the incoming sound (i.e. record the meetme) or listen to all the dtmf which is entered by others within the meetme. (3)

I would like this since these functions are not all possible using the manager API / Agi scripts, as the latter do not work with SIP channels in a meetme.

Is this possible, or do I have to look at an external product (sipXpbx)?

PS: I know (1) and (2) are possible, but wondered about (3)