Remember EWP is very stable to begin with and no timber is going to shrink a notable amount tangibly (length.) Even as a fully housed live edge joint in the Japanese/Asian modalities that I work in do not require any kiln dried wood, and the "techniques" of working with them is the focal point.

Kiln Dried lumber is just not part of this craft, nor ever a necessity in scope. Proper technique and selection of timber is.

I concur with Brad bb...if it is available one could use a vintage timber...yet still not a necessity.

I would further note that we work (80% of our business) in historical restoration...particularly Barns...Even then if we have to do a augmentation, we don't always use vintage material as often "plugging in" new work creates a clear demarcation between original and new. Again these timbers are "fresh" just as the original Barnwright would have used when working a new frame into old.

Good luck,

j