LNK TRACON CTLR EXPERIENCED CONFLICT AFTER CHANGING INITIAL SEPARATION PLAN AND ISSUING VISUAL APCH CLRNC TO LR45 ARR ACFT.

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I'M NOT SURE HOW TO CLASSIFY THIS AS THERE WAS NO LOSS OF SEPARATION AS REQUIRED BTWN VFR AND IFR ACFT IN CLASS C AIRSPACE. THAT BEING SAID; THE SITUATION WAS ONE WERE IT COULD HAVE EASILY DEGENERATED INTO SUCH. I WAS WORKING APCH IN THE TWR CAB. IN ADDITION TO ACFT #1; AN ARR TO RWY 17; AND ACFT #2 A VFR HOLDING AT THE LNK VOR AT 4500 FT; I HAD A SEQUENCE OF 3 ACFT FOR RWY 14; A VFR DEP TO THE NW AND AN IFR OVERFLT TO THE S. WITH THE VFR HOLDING AT THE VOR AT 4500 FT; I WAS VECTORING AND DSNDING A CRJ2 FOR RWY 14. ACFT #1; THE LR45; WAS N OF THE CRJ2; AND I WAS STEPPING HIM DOWN ON A PARALLEL COURSE. I DECIDED TO TURN THE LR45 STRAIGHT S TO COME IN BEHIND THE CRJ2 SO I COULD DSND AND PUT HIM ON THE L BASE TO RWY 17. WHEN I INSTRUCTED THE LR45 TO TURN TO 180 DEG HDG; HE RESPONDED THAT HE HAD THE CRJ2 IN SIGHT. I ASKED IF HE HAD THE ARPT IN SIGHT AND HE DID; SO I CLRED HIM FOR THE VISUAL APCH TO RWY 17 AND TO MAINTAIN VISUAL WITH THE CRJ2 GOING TO RWY 14. I IMMEDIATELY WENT TO ISSUE CTL INSTRUCTIONS TO THE 2 OTHER ACFT ON VECTORS TO RWY 14 AND THEN TURNED BACK TO THE LR45 TO XFER COMS TO THE TWR. I DID ANOTHER QUICK TASK AND THEN LOOKED BACK AT THE LR45 AND SAW THAT HE WAS SWBOUND TO LINE UP ON A STRAIGHT-IN RWY 10 FINAL AND I ALSO SAW ACFT #2; THE C172 HAD TURNED TO WHICH HE ACKNOWLEDGED. AS I WAS WORKING IN THE TWR CAB; I IMMEDIATELY TURNED TO LCL CTL TO HAVE THEM ISSUE TFC TO ACFT #1. FORTUNATELY; ACFT #1 SAW THE C172 AND CLBED BACK TO 5000 FT BECAUSE THE C172 CAME BACK A COUPLE MINS LATER ASKING WHAT THE HEADING WAS HE WAS GOING TO TURN TO. I HAD A PLAN THAT WOULD HAVE WORKED GREAT; BUT I ALLOWED MYSELF TO BE TALKED INTO HAVING ACFT #1 MAINTAIN VISUAL SEPARATION WITH THE CRJ2 WITHOUT FURTHER INSTRUCTIONS TO PROTECT FOR THE VFR ACFT HOLDING AT THE VOR AT 4500 FT. CONFLICT ALERT DID ACTIVATE BUT NOT UNTIL AFTER ACFT #1; THE LR45; HAD ACFT #2 AND WAS LEVEL AT 5000 FT.