It would be terrible. Scimi doesn't have the turn rate to use dhc or dbb. It won't come close to the dps of escorts sporting the same weapons, much less beam array cruisers.
Valdore console haven't reached the "mandatory" status of plasmonic leech, but you should still have it.
I am not a expert builder or even very experienced but my crap Mk X blue geared Falchion can turn at 16.7 at full speed. While this isn't Escort levels of turn value, it has been more than enough turn rate to allow me to keep my cannons on target.
Also when I switched to beam and broadside using the same Mk X blue gear levels, my performance and survivability went way down and I found myself struggling doing the same content I felt OPed on before.
Again, I am just a fledgling level 50, brand new to the game for the most part but I think there is at least some evidence supporting the Scimitar as being a good cannon boat.
I'm sorry, but if you have issues getting good turn rate out of the Scimitar in today's STO, you have some huge lapses of what you can do these days. You are not getting Escort handling, but with today's game, you can easily present your weapons. The fact that this is feasible even with a slow-as-molasses-in-winter Bortasqu' today should say alot.