Bishop's transcripts - that doesn't sound as if it concerns living people. I avoid adding living people to WikiTree, whether related or not.
On the other hand, I add people I'm not related to all the time - either because i drift off sideways, exploring the ancestors of some spouse of a distant cousin or because I get interested in an unrelated family in the same parish where I have kin. This is one of the joys of WikiTree, that you can truly work om expanding the global tree.
So, the first strategy for finding a starting point for your 300 would be to do a search and see if anybody is already in the tree, that you could use as a starting point.
Or it may be more practical to just start at the root of the received tree - there IS a root? - and build from there, looking carefully at suggested matches, of course.