Italians sure knew how to make bikes that handle well. Ceriani forks were great when they were new. Marzocchi and Paioli as well (but they had various tiers, from top racing stuff to mass produced suspension).
However, a very good solution would be to use Moto Guzzi forks. The V65 had 35mm tobes, same as the CB450 (I think the V35 and V50 had 32mm). The Nevada and a few other models probably also used 35mm ones. These forks are special, because Moto Guzzi was the first manufacturer to use real cartridge forks. This allows manufacturers to make modern cartridges that fit into them. The stock ones were nothing too great, but you can easily find a new modern set of adjustable bitubo cartridges that will make the forks function a lot like brand new forks, and they fit right in. But they also have the 70's styling, and if polished, they look really nice. Also, the double piston Brembo calipers would fit on those forks, and those are a lot better than any 70's japanese calipers. You would probably need to use the Moto Guzzi front wheel and their cast iron discs (which, again, are a lot better than any 70's stainless disc). So, with this setup, you'd get a front end that is performance-wise comparable to modern forks, yet with the classic styling. Here's my 77' V35, that had such cartridge forks (just 32mm):
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Replacing the stock triple trees for aluminium ones would not be a bad idea either. Stronger triple trees sometimes make a big difference. You can also get spoked front wheels (f.e. from a Nevada model, or similar). If you replace the triple trees, perhaps it would be even easier to find 38mm forks from the big-block models (f.e. T5), those will be even more rigid, and there are probably even more aftermarket cartridges for them.
For the shocks, Marzocchi did make performance aftermarket shocks specifically for Honda (Italian bikes otherwise all had eye to eye shocks):
These are quite good, and easily rebuildable. You can adjust the oil pressure by pressurizing a rubber bladder. I have a few pairs of the older (f.e. AG1) adjustable marzocchi shocks, but I do not know if they made such for Honda. These were made in the 70's, and look more period correct (but they usually come with a special price):
I've a pair with chromed springs and polished aluminium. Those fit perfectly on classic bikes... I think some sporty Ducati bevel twins used them originally.
80's Benelli models were esentially such bikes. They've completely copied the Honda engine, but used their own frame and suspension. De Tomaso owned both Moto Guzzi (a huge factory at the time, and a big pride for Italians) and Benelli (a small factory that made two strokes). They made these Honda clones in the Guzzi factory, mainly with Benelli badges. They had the Guzzi suspension. They handled a lot better than a Honda, but they were more expensive and never really sold well.
