I think you’ve outdone yourself - this is quite the wall of text 😉

But as to the details, the idea looks feasible enough, though an order of magnitude more difficult than Restructured.

Now to the concept - I quite like the idea of the singleminded focus on the map to Luke, but in taking out all of the Starkiller’s weapon capabilities might diminish that audaciousness people have come to expect from Star Wars, whether it be literal robot armies, millions of clones, turning a Republic into an Empire overnight, A planet destroying superwewapon, ships with literal cities on them, and the batshit insanity of building the same planet destroying superweapon again. Without the Starkiller weapon, it’s a rather standard treasure hunt plot.

The Star Forge idea retains some of this audacity, though many of the logistical problems remain - there are a lot of instances where the Starkiller is referred to as a weapon. The Star Forge idea would require a lot of re-dubbing and some fancy effects work to place destroyers in their proper locations - though this idea would make sense of several weird aspects of TFA such as Snoke’s indifference to the Starkiller’s destruction and to Poe’s astonishment at the shiny new Destroyer.

JEDIT: Now that I think about changing the ‘shield’ dialogue to ‘map’, it’s seeming less and less feasible. Han definitely says ‘shield’ several times during scenes where it’s difficult to impossible to cut away.