converting the Ion B2 spreader bar from a standard hook to a rope spreader type is easier than you think, I did not know this and bought the Ion waist harness rope spreader bar, and wish I had not wasted my £50 as the stiff backing material gave me a right pain in the torso as it dug in hard, the council refuse men removed it to land fill( but I kept the stainless spreader bar as this can be re used)
The B2 standard bar with standard hook just needs the hook cutting off and making smooth where the 2 stainless rods are welded in place,
after this has been done remove the bar from its soft backing (2 large cross point screws at the rear) and then turn the bar 180 deg, (upside down) and re fix to its backing, the 2 stainless rings will now be on the top side of the bar,
now all you need is 6 or 8mm dyneema line, double the line over and pass the closed loop end through the ring mentioned nearest the "clip in" end and then loop this over the bar at the clip end, then pass the two free ends through the opposite ring, pass one end under the bar and the other end over the top to meet the same, then using a reef knot tie them together, once you are happy with the length of rope slack(around 4-6 inches out from the bar)
then cut the free ends around 1cm from the reef knot,then melt the ends to ensure no fraying or slippage can happen. bingo!
I have never thrown away my old harnesses all Ion B2, all the bars (which have never changed) have been cut a converted, 5 of them!
why would anyone use a standard Hook? beats me, the rope style is more comfortable, safer(double 6mm dyneema has never worn a bit in 12 months),no chance of a phantom release when your chicken stick slips out,no chance of damaging your board, or scratching your car as you brush past its corner.