I'd say coupe only bumpers are specifically NOT allowed on a drop top due to the explicit limitation on intra-body style UD/BD.
but at this point, if the rule wording were to be "tightened" to reflect Greg's (not to single you out) version, there would suddenly be a lot of illegal cars out there.
to go the other way might open up some unforseen process breakers. this is likely a small number and fixable once the "prime" setup is discovered and measured.
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