two options spring to mind.
1) ridgeback dual track quest…if the geometry has not altered too much since my 2008 model (equipped with conti vapor 2.1 29er’s), then it may be possible to swap the front tyre for a panaracer rampage 29er.
i swapped the rear for a jones 1.8, allowing mudguards to be bodged in.
..and a rear rack (topeak disc) fits no problem btw.
2) islabikes beinn 29er. well received in the cycle press and light too (25-26 lb). one chainring only (8 speed).
commuting generally involves fitting mudguards so i was told that with 29ers you bodge the widest sks 26er mudguards into the frame (may require help from a good bike shop).
best of luck!