CAPT OF AN SMT ACR ACFT INADVERTENTLY FLEW BELOW REQUIRED RTE ALT IN A SPECIAL FLT RULES AREA.

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I WAS CAPT ON AIRLINES FLT FROM GRAND CANYON; AZ; TO LAS VEGAS; NV. WE INITIALLY MADE A SLOW CLB ON DEP TO 10500 FT MSL ON THE SFAR 50-2 BLUE-DIRECT S RTE WITH THE INTENTION OF DSNDING W OF GRAND CANYON WEST ARPT; JUST OUTSIDE THE SFAR. HOWEVER; UPON REACHING 10500 FT; WE DISCOVERED WINDS ALOFT FAR GREATER THAN FORECAST; APPROX 40 KTS; CAUSING US AN EFFECTIVE GND SPD OF APPROX 110 KTS. AT THIS RATE; WE WOULD NOT CLR GRAND CANYON WEST ARPT AT 10500 FT BEFORE EXCEEDING OUR FAR PART 135 OXYGEN LIMIT OF 30 MINS. ACCORDINGLY; WE DSNDED TO 8500 FT; WITH THE INTENTION OF CLBING; AGAIN; ABOVE THE GCN MINIMUM XING ALT OF 9000 FT (8500 FT IS AN ACCEPTABLE ENRTE ALT; BUT ANY CHANGE IN ALT WITHIN THE SFAR REQUIRES A DEV RPT). WE ANNOUNCED OUR INTENTIONS; AND THE ACTUAL DSCNT ON THE APPLICABLE SECTOR FREQS; AND LEFT ALL OUR LIGHTS ON DURING THE DSCNT. HOWEVER; AT 8500 FT; I DISCOVERED THE WINDS AS GREAT AS 10500 FT. I PROCEEDED TO MAKE SOME QUICK CALCULATIONS AS TO FUEL CONSUMPTION; TIME OF ARR; ETC; AND RPTED TO OUR COMPANY DISPATCHER. OUR DISPATCHER SEEMED UNIMPRESSED; AND SAID THEY'VE KNOWN ABOUT THE WINDS ALL DAY (NOBODY INFORMED US). MEANWHILE; WE FORGOT TO CLB; AGAIN; OVER GCW; THUS VIOLATING THE MCA OVER THAT ARPT. TO MAKE MATTERS WORSE FOR MYSELF; I EVEN MADE A VOLUNTARY POS RPT OVER GCW AT 8500 FT (I MEANT TO KEEP ANY OTHER TFC ADVISED; BUT INSTEAD; INCRIMINATED MYSELF). I DISCOVERED MY ERROR AFTER LNDG. I GOT DISTRACTED AND MADE A MISTAKE. I HAVE NOT MADE THIS MISTAKE BEFORE; AND I WILL NOT MAKE IT AGAIN. BUT; AS A PRACTICAL MATTER; I THINK THE COMBINATION OF MANDATORY RTES; ALTS; AND MCA'S; IN CONJUNCTION WITH THE OXYGEN REQUIREMENTS OF FAR PART 135 ARE ONEROUS. IT'S A 'GOTCHA' THAT OFFERS NO REAL INCREASE TO FLT SAFETY; AND; IN FACT; HINDERS FLT SAFETY IF IT MEANS THAT A PLT SHOULD REMAIN SILENT ON THE RADIO SO AS NOT TO INCRIMINATE HIMSELF. AN MCA OVER CGW OF 8500 FT WOULD DO MUCH FOR SIMPLIFYING THINGS AND ELIMINATING BUREAUCRATIC HEADACHES.