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You'd need a 2wd transmission, then you'd need to fab the mount, shifter linkage, and have 3 driveshafts made.
However, all that said, it might be cheaper and easier to go with a married TH350/NP205 combo, esspecially in a K5. The longbox pickups and burbs that are lifted a great deal benefit from a divorced 205, as it reduces the driveshaft angles, but in a super short rig, the rear shaft can become too short.
Well, you COULD put a divorced '205 on the rear output of your 203 for a Doubler
OTOH, you'd have a miserably short rear driveshaft, an excessively long front one, and more exhaust routing and crossmember issues than I wanna think about
Keep your '203 as the front end of your Doubler, and just get an appropriate '205 (prolly TH400, but whatever.)