Go for it.
And yes, a single robo is fine, especially an adopted one of one going free on Gumtree.
The 8" Trixie wheel is fine too. You have everything a wee robo will love. Just a cardboard tissue box without a floor would be fine as a nesting box as they love digging down under it into the substrate and plain white ripped up tissue paper for nesting. That`s it. x