If you want a 40 or 48 spoke rear wheel , because Shimano's tandem cassette hub
still uses at its core , the 10x1mm axle, just ships with a longer one ..

the competent Shop can substitute a shorter axle in thehub and then build up a wheel around It,


My several bike tours, solo ..bring the camp gear .. I used a Screw on Freewheel hub, (Phil Wood)
and 48 spokes (700c-35 tire) one spoke break was no issue ,
having built the wheel, a bit of spot truing , on the bike and the rim ran evenly between the brake shoes again.

Met a nice person with a big adjustable spaneer , and pulled the freewheel and replaced the spoke ,

a few days later, on up the road, then had a few pints with my helpful Local .