I would be careful about using a hanging bridge (not sure which type you mean though) or anything with chains as hams can get feet caught in chains. I didn't use the Barney ramp - initially I had a cork log wedged part under the shelf - this made a tunnel and also a kind of ramp to climb up to the shelf. But when Charlie got older and found it harder to climb, I had a short shallow ramp at the front of the cage, made from this bendy stick bridge that screws to the bars (keeps it stable) - that worked really well.
BRIDGE HOUSE SHELF RAMP CHIPMUNK,HAMSTER,RAT,DEGU CAGE | eBay
The other way he could get to the shelf was through a rat tube tied to the roof
It led from a shelf on the back right corner into a rat sputnik, with the rat sputnik sitting over the shelf. That way they can have a roof run and a second way of accessing the shelf - or do circuits! Up one way and back the other way.
Or did you mean this one? They're ok
I had one but the end part snapped off
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Or some people stick lolly sticks on the ramps to give fooholds