More challenging to get a good compact shape in a small bonsai but can still work well:
Juniperus chinensis
Japanese maple
Crab apple
Chaenomeles 'Chojubai'
Search through pictures of Shohin displays and try to ID the species that are being used elsewhere then see if they will cope with Utah conditions.
I missed Chinese elm 'Seiju' last time. Excellent as it is tough, has small leaves and develops corky bark.
Standard Chinese elm and corky bark Chinese elm can also be good but leaves are a bit bigger.
Ficus sp, especially sp that reduce leaves well.
I just looked through about a 100) 3gal nursery Abelias and found one (ok a few) with nice trunks. Bought the best one, reduced roots and top, put into a smaller pot and here we are