i second the idea of painting the lowers black… it'll continue the line from the headtube being black, and also balance the black in the frame with respect to the yellow and red.
can't help with the bar, those are bloody hard to come by, though i do have two, both on builds already, sorry! but perhaps could assist in the post, as i think i might have a spare in the rare 27.0.
is your black post 27.0? as i couldn't confirm if my thunderbolt should take a 27.0 or 27.2 as they were transitioning around those mid 90s years.