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OpenVMS for x86 already exists. It is called Windows (from 2000 to 2008 and 7, based on NT).
The NT kernel was almost a clone of VMS, made by the same designer Dave Cutler
Just because there are similarities does not make Windows OpenVMS. Just because they are designed by the same guy does not make Windows OpenVMS.
By your criteria, OS X, Linux and Minix are all AIX, because they use the similar designs, and philosophies.