All those ideas will not work if you start using inspection types. If the inspection type is setup to post in QI stock, then it does not matter what stock type is shown in MIGO for 101.
And if the stock type is already turned to QI stock in the purchase order, then you even lost with having the field in MIGO as display only as you could not turn it into unrestricted.
I wonder anyway about the concept, any external procured material goes in unrestricted, but any material procured from a sister plant goes to inspection. You trust more your external supplier than the internal.
Further 101 is as well used to receive goods from production, even from different transactions than MIGO
It is used in one-step STO processes with delivery.