I'm trimming my AK collection, but I'm going to keep two 5.45 guns (SGL31, 104UR).
At the end of the day I am a collector and as such, the 5.45 AKs represent an important step in the evolution of the rifle.
Unlike quite a few, I base my collection on diversity/history rather than chasing the cheapest bang for the buck. (They also happen to be incredibly fun to shoot)
Save a space for your favorite(s) and dump the rest. Collect, enjoy and pass on the history of the caliber/rifle. Don't let supply chain paranoia dictate your choices. Stock up a bit now, but the caliber will always be around in some form. Worst case scenario, you don't shoot it/them as much as the other rifles in your collection.