Super-Fox 12-gauge guns typically had 5-6" long choke tapers and with 45 to 50 thou constriction. Using a good bore mike I think you'll find plenty of remaining choke. That's assuming the chokes weren't opened up along with the 2" barrel cut. Not likely.
You say the ejector rods have been removed, and since the rods or "stems" are integral with the ejectors I assume you mean they've been cut off for extractor only function. Just for info, the stems can be spliced and lengthened with air hardening tool steel by a good machinist or gunsmith with access to machine tools, i.e., lathe and mill. The front end that's hit by the ejector hammer is all that needs to be hardened.
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