I understand the fear of this were to happen of losing a low serial number, but hang on to your hair cause I’m gonna blow your wig back!
Why not merge the markets. I know people with low serials fear losing their low serial numbers since there are 3 separate markets.
A solution to that might be add a nomenclature to items before merge. If it was a PC item before merge ad PC to end of serial#, PS to PlayStation and XB to Xbox items.
And then there could be 3 variant serial #1 items PRE market merge.
Items after market merge will share / pull from the same serial pool. Effectively allowing to be one market.