Rafter tie replacement

We are opening up the ceiling in our kitchen to a vault/cathedral type from basic flat. House was built in the 70s, standard rectangular hip roof with 5/12 slope, ceiling joists (some of them) were doubling as rafter ties. Ridge board (not beam) and split/offset load bearing walls interior. Plan was to use 4/6 beams to replace rafter ties from outside wall to load bearing interior wall, span 12 ft, at 48" oc. My husband wants to go with LVL basically 2x10x14 for overlap on load bearing interior wall. Will LVL work the same as stick wood used as a rafter tie? How would you connect it to the rafters and the walls (sill plates?) Since the ties are to resist thrust on the walls, and there shouldn't really be any heavy structural load resting on them, do I need to worry about them sagging?