I'm not so sure that they'd form a new group. For that matter, simply asking the party to clean out the guarded compound just so that the two groups could have a new HQ seems rather "evil".
I think that these two groups would be working together would be to oppose the current vampire infestation of Athkatla. Destroying the undead is certainly a part of Lathanderite mission. And I just cannot imagine that the Radiant Heart wouldn't be highly interested in destroying the vamps.
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