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Re: SPLIT-HALF COUPLING - replacing old keyway'd coupling
If the rest of the present coupling is in good shape, why not consider simply to cut another keyway in the 'old' coupling ... at 180° from the buggered keyway? You probably have setscrews, etc. that were inadequate to stop the coupler from errantly rotating on the shaft .... so ADD more set screws, etc. so you dont bugger the new keyway. Any competent local machinist shop can do this.
Note: a keyway is usually NEVER used to stop rotation, only to serve as a 'backup' if the primary means of restraint (set screws, 'clamps', interference/forced fit, etc.) fails.