I can't think of anything - that's the drawback with conifers. Sorry.
No light, no water, no nutrients. :-(

Try ferns, evergreen and otherwise (evergreen - dryopteris erythrosora, polystichum polyblepharum, cyrtomium, asplenium scolopendrium, and dryopteris affinis, almost evergreen), epimedium, geranium phaeum, euphorbia robbiae (be wary of its invasive habit), ruscus aculeatus, sarcococca. Give them as good a start as possible, and a bit of time. It's amazing how plants want to live. PJ

Mahonia repens is native to dry pine forests in northern Arizona, it might be worth a try.