The bottom line is it is quite difficult to get the items now for the wrong reasons. The fights are easy. Assembling people (even 3-5) for the fights is not. The reason is that the egg/beard/tongue are the ONLY items worth anything that drop off kings or the KS version of kings. You aren't going to be able to buy them since EVERY camper is there for those items now. There is zero incentive for non monks to help. And with a 15% drop rate if everyone is forced to use their own seals since EVERYONE doing the ks fight will be lotting bb items (because the other items are worthless) you are looking at 2100ish kindred seals to complete a black belt.

The best alternative is just to make a better belt. Haste 10%, Str 7, SB 5, Store TP 5 (or something like that). 12% haste is overkill with the current ideal gear so a 10% haste belt with better peripheral stats would fit the bill. Put it in WOE or somewhere else that is challenging. But be sure you give other jobs incentive to do the BC or it will be difficult for the wrong reasons instead of the right reasons.