LanX> I'm trying to trigger insertion of  text-snippets into the current
LanX> buffer/point from external scripts.

If you don't mind shell typing commands into the mini-buffer, then
shell-command (typically bound to M-!) will do what you want.

To give an example, the text on the line below
Sun Nov 29 19:28:15 EST 2009

Came from 

   ESC 1 M-! date RETURN

(The prefix argument inserts command output at point, as opposed to
inserting the command output into a separate buffer.)

Steve