player.moveto XX023286
Where XX are the load order numbers/letters of the mod in your load order, or the first two letters of the ID of any object added by Kragenir's Death Quest that appears when you select it with the console.
I went back to an earlier save at Bramblepoint cave. I picked up Iplanderin's glowing note, read it and got the quest update about remembering someone in Bravil. I immediately tried your suggestion, and was transported to a spot in Bravil down and around the corner from Silverhome. No Heinz.
Do you have any other ideas? I do, by the way, appreciate the time you are spending on this!