gen goto-address-at-point: jump to msg in gnus group: Msg-Id;

Hello Would it be possible to generalise the goto-address-at-point, such that it would be possible to jump to a certain message --which is uniquely determined by its Message-Id-- from some buffer outside gnus? I know that using mouse-2 with in gnus that is possible under certain circumstances. The reason why I am asking this is the following: I have written 2 functions, which insert the author and the subject of a given message either in my todo file (I am using here Oliver Seidels todo-mode.el) or in my diary file, in order to remind me which mail I have to answer. Now I could also insert the Message-Id and if I had a navigation tool as described above, I could jump to the message I would like to reply to. Does anybody has an idea? I know about nntodo.el but for me that looks like just copying the message I have to reply to a special group. Thanks Uwe Brauer