You'll have to go with an aftermarket backhoe since Kubota never offered its own hoe separately for the BX. Instead they offered a variation of the BX sold as a tractor-loader-backhoe package. So when the
BX2200 was in production, the TLB equivalent was the
BX22. Probably the most common aftermarket backhoes for BX tractors are from Woods Equipment:
Product Details
Others offering backhoes for subcompact tractors include Rhino, Wallenstein, Woodmax. With any of these, you'd need a subframe that would fit your
BX2200. Since it has been a dozen or so years since that tractor model was current, I don't know if all manufacturers can still provide a matching subframe.