Responses from Matt at Swallow yachts in case anyone has a similar issue in the future
About the tabernacle
Yes, the tabernacle should hopefully be hammered back straight and screwed back in. Epoxy fill the holes first, then let set, then re pilot drill them, then screw back in.
About the block
To fly an Asym, use the Barton size 4 fiddle block with fixed end:
Fiddle- fixed eye N05410