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Modern polyester coatings are pretty much inert. The only problem you'll encounter with the "factory finish" on Dibond panels is adhesion of subsequent paint films. I'd recommend thoroughly scuffing the surface with a fine scotchbrite pad and simply settling in to begin painting.
Naturally, if you're really interested in "archival permanence", I'd recommend that you perform some short-term tests to your own satisfaction. I would not think an acrylic coating would be a good interface between Dibond and oil paint.
Other than the similar chemistry, there's really no correlation between polyester textiles and polyester coatings . . . rather the way that acrylic artists' colors, acrylic fiber and acrylic sheet (plexiglas) are quite dissimilar substances.
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