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Question up front: has anybody (or seen anybody else) converted the OBS from RABS to 4 wheel ABS?
Searching gets a mess of results. None of them indicate this was done or even thought about. Another possibility is that the keywords just get too many hits.
In doing a parts search, it looks like there are some paths. One of them is a SD axle swap. And it is looking like another is a van front axle swap as parts searches shows the vans got ABS earlier than the pickup.
Naturally, it will take a little rework of the hydraulic lines and a different electronic module.
This might also make the jump to a SD PCM go better as well.