I doubt that a manual-shift valve body is an "on the shelf" item for your two-speed, since there wouldn't be much demand for it. And a custom-reworked one would be very expensive, even if you could get someone to do it. But on the chance that I'm wrong, call a major manufacturer like B&M and ask. However, manually shifting your two-speed wouldn't gain much performance, anyway.
No, trans doesn't have to come out to change a valve body.
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