I´m running CB900 Boldor shocks on my caferacer.
They are 30 mm longer than stock 500/750 items.
Bolts directly on.
The raise of the rear ride height quickens the steering a little and gives a more aggressive nose down stance.
Works out perfect on the 750 and might take care of your clearence issues.
The shocks can be found on the CB750-900-1100 Boldor as well as the CBX1000.
Plenty around on Ebay
Just a thought
Your project is coming along very nicely! Looking forward to the next update!
Cheers
Dan