No need to overcomplicate this. You wouldn't even need a full blast barrel vice and action wrench if you get a gunsmith to pull the tikka barrel the first time (I am in Papakura and can do this for you). Factory barrels are massively over-torqued to what is actually required in normal use.
Buy or make a vice jaw that holds the barrels firmly and wont scratch them. It does not need to be grunt as you are not planning to pull factory barrels with it, so would work fine in a bench vice.
Then get a bolt raceway action wrench that extends far enough out the back of the action to get a torque wrench on it. Again, since you are not wrenching off factory barrels, no risk of damaging the receiver with this wrench.
This way you can change barrels without removing the optic or stock from the rifle. Torque of around 70-80 ft/lbs is plenty and will not stress a bench vice based barrel vice at all.
Plenty of PRS and benchrest guys doing exactly this.
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