Here is my current situation and what I am hoping to do:

I have been done with RTK for about a year now. I find I dont need to test myself so hard using only keyword.
Recently I have been following the AJATT advice, and putting the stories in the Question field, along with the keyword. Its going quite well.

I have a Heisig deck that I had previously imported into anki a while ago with scheduled data.

So now,  I want to add stories to all my Heisig cards.

Is this ever possible? It doesnt seem that there is a decent plug.