In game I through this refit should have been just for a lakota hero unit, and the standard excelsior design be the only one you could mass produce.
My head canon for the Enterprise B was that it was eventually found adrift somewhere, maybe a decade or so after the crew was all killed by the infection, and it was just kind of mothballed and set aside. When the dominion threat became real, it was dusted off and used as a test bed in a modernization project for excelsior class still in service. It was one of the oldest excelsiors still intact, constructed in the 23rd century, if it could be properly modernized any newer excelsior could. It was also recommissioned as the lakota.
Also head canon, the B/lakota was the only 'b' type excelsior ever constructed, the show itself hardly contradicts that.
fangoriously
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