I realize that the chart is for much higher speeds than what you have - but it all depends on where you place your decimals. LOL
Personally, If I were going to do something like that, I would go with a double reduction set-up, - a 2" pulley on your PTO shaft & a belt to an 8" pulley with another 2" pulley on the same shaft as the 8", but behind it. Then another belt from the 8/2 to another 8" pulley that is connected to the bevel gear. 540-135 First 4 to 1 reduction, then 135-33.75 for the Second 4 to 1 reduction. Not knowing the size of your bevel gear, you may have to adjust the size of the pulley that connects to it (probably smaller).