RWY INCURSION WITH A TKOF INTO ARR TFC BY AN AEROSTAR PVT PLT DURING A NIGHT OP AT FNT; MI.

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AFTER NOT FLYING IN 60 DAYS; AND IN PREPARATION FOR A VACATION IN FLORIDA; I DECIDED TO PERFORM THE REQUIRED NIGHT LNDGS AND PIC IN TYPE TIME; AND FLY 2 ILS APCHS. I LEFT PTK AND FLEW DIRECTLY TO FNT; A CLASS C; 7 MINS TO THE NW. CEILING WAS 2900 FT AGL; 10 MI VISIBILITY. ALL THIS OCCURRED AFTER 'LEGAL' SUNSET. FNT IS A CLASS C AREA. I MADE APPROPRIATE CONTACT AND WAS VECTORED TO THE ILS RWY 9 INITIALLY; THEN REASSIGNED TO THE ILS RWY 27. IT IS IMPORTANT TO NOTE THAT COMMERCIAL TFC WAS LNDG ON RWY 9; WHILE THE TWR HAD ME FLYING ILS APCHS TO THE OPPOSITE END OF THE SAME RWY; WHICH I FOUND QUITE DISTURBING. FIRST APCH; WITH FULL STOP AND TAXI BACK; WAS UNEVENTFUL. ON THE SECOND; I WAS VECTORED PAST THE GS; AND SUCCESSFULLY RECAPTURED THE APCH. I DID NOTE THE APCH CTLR'S APPARENT LACK OF ATTN AT THAT TIME. AFTER THE 2ND FULL STOP; FNT TWR ADVISED 'THERE'S A B717 ON FINAL ON RWY 9; AND YOU NEED TO EXPEDITE.' YOU MAY WANT TO REFER TO AN ARPT DIAGRAM TO UNDERSTAND WHAT HAPPENED NEXT. I WAS TRAVELING EBOUND; APPROX AT THE INTXN OF TXWY C AND RWY 18/36. IT WAS COMPLETELY DARK AND I TRY TO KEEP THE COCKPIT LOWLY LIT TO ENHANCE NIGHT VISION. FNK TWR CLRED ME FOR IMMEDIATE TKOF 'FROM THE INTXN OF RWY 18 AND TXWY C.' I THOUGHT THEY CLRED ME FOR TKOF FROM THE INTXN ON RWY 27 AND RWY 18; WHICH I HAD DONE MANY TIMES IN THE PAST! I AM SURE I REPEATED BACK 'CLRED FOR INTXN TKOF ON RWY 27!' AFTER TURNING ON THE RWY I SAW THE LNDG LIGHTS ON THE B717 QUITE A WAYS OFF. I DO NOT FEEL WE EVER CAME WITHIN 3-4 MI OF EACH OTHER. HOWEVER; I WAS A LITTLE HESITANT. AT ROTATION; WHICH WAS A GOOD 30 SECONDS AFTER CLRNC; FNT TWR ADVISED ME TO 'TURN L AS SOON AS POSSIBLE' AND CANCELLED THE B717 CLRNC. OK; SO WHAT CORRECTABLE ERRORS WERE MADE? YES; I SHOULD HAVE 'HEARD' THE REVISED DEP RWY. BUT THE TWR SHOULD HAVE MADE SURE I UNDERSTOOD THE CHANGE; AND THEN WATCHED MY ACTIONS. THIS WAS AN ABSOLUTELY DIFFERENT CLRNC FROM ALL PREVIOUS INSTRUCTIONS; AND I AM SURE I REPEATED THE CLRNC AS RWY 27. NOBODY HAD TAKEN OFF FROM RWY 18 THE ENTIRE TIME I WAS IN THE 'PATTERN.' IN MANY YRS OF FLYING TO FLINT; I HAVE USED RWY 18 MAYBE 3 TIMES. I FEEL THE TWR PERSONNEL WERE PLAYING 'RWY ROULETTE;' WITH POSSIBLE SERIOUS CONSEQUENCES. I GUESS I AM SO USED TO THE BORING REGULARITY OF ALWAYS DEPARTING FROM THE WINDWARD RWY; THAT; IN THIS ONE NIGHT OF CALM WINDS; I FAILED TO COMPREHEND THE WHIMS OF THE TWR. IN 14 YRS AND 2300 HRS I HAVE NEVER MESSED UP A TKOF CLRNC THAT BADLY. BUT AS IS USUALLY THE CASE; IT IS NEVER ONE THING THAT CAUSES AN ACCIDENT. THIS IS A CLASSIC.