G'day geenhorn,
Yep, I'd say using the re-machined hub that way will not cause any problems. If a furnace is available, that would be a better technique than torch brazing.
The exploding wheel problem is due to the hoop stress acting on the periphery of the wheel exceeding the strength of the repaired material.
Another cause of this can be overspeeding, e.g. steam engine flywheels have been known to explode violently when the engine speed governor failed, allowing the engine to exceed its design rpm, and overstressing the wheel periphery.
This is an extremely dangerous event; the rim and spokes of a big stationary engine flywheel can have total weight in the tens of tons, and ton plus pieces have been known to fly hundreds of feet when a big flywheel has let go.
There's a pic of the aftermath of such an event in this post;
https://www.oneguyfrombarlick.co.uk/viewtopic.php?f=59&t=2252&start=1775#p100918
