That thing looks like a unholy hodge-podge of parts and a complete nightmare for finding replacements.
I don't even know what I am looking at for dash buttons here:
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The "Rear Wiper" switch looks like a parts store rocker switch R&R and the center right is non-stock, but the others look like OEM, but nothing like I've seen on a GMT400 before.
Also, as
@1998_K1500_Sub pointed out, it has the ARTEB tail-lights with the amber turn signals.
This is of interest to me as it also looks like it was rigged up for a 7 pin trailer connection.
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As it appears to have the standard multifunction switch stalk, I cannot for the life of me figure out how it isolates the rear turns and stop lamps on the taillights, and have a functioning 7 pin trailer harness (which combines turn and stop signals), without some sort of changeover relay logic.
The VIN, 3GMGK26F0XG950067, is nicely shown in one of the photos, which does pull up a RHD suburban in acdelcoTDS.
Unfortunately, the wiring diagrams for it are not present like on the LHD service manuals.