Alternatively temporarily attach the non-vSAN storage to the vSAN nodes (perhaps even just one) or vice-versa e.g. join one of those hosts to the vSAN cluster temporarily.
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Just finished a migration like this and it worked without a hitch.
be mindful of different hw architecture can prevent a vmotion.
in our case we had to upgrade to atleast vm hw level 9 to be able to do migration between new intel 61xx series cpu from 26xx v2