Automatic vs Manual Pick based on Item Attribute on Pick Release Rule

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We have a requirement: Ability to flag at item level if order line should be automatically picked/manually picked. If an order has auto-pick line items having same ship set as the items which are on manual pick, then the auto pick program should not pick the entire order.

We were thinking of  adding EFF in part master which populates EFF flag in order line. Custom release rules solution to have these EFFs to enable this requirement. Please advice if you have used custom pick release rules and is this a feasible solution or do we need to build a custom wrapper for pick release?