THAT'S BEAU*TIFUL WORK.
you know me. the fly in the ointment...
The quick fix for sagging beams and flattened coach roofs has been thru-bolting a piece of
metal plate across the span to the ole beam. It's in the Manual.
But it occurs to me that a beam of your excellent proportions
could have a 1/4" slice taken out of the center (not through the cabon layer!) - the long way - and replaced with a carbon insert like the one on top. Or of course stainless.
But carbon is the theme here.
Given the stiffness of carbon, and the epoxied-in 'plate' supported against deflection by the wood on either side, you'd have a compression beam that would NOT require a post..... a non-compressable beam.
Beam ends would need minimal vertical support of course.) Just being helpful
(buzzing off then.....)