Thank you for the suggestions!
I'm in USDA zone 7a. I'm considering these plants in a mixed hedge: Amelanchier alnifolia, Atriplex halimus, Caragana arborescens, Poncirus trifoliata, Ribes nigrum.
I planned Limes to another location but it is all on paper for now.
Espailered trees look really impressive! However, I want something shorter in height than a tree (though recently I realised that trees can be shrubs and shrubs can be trees).