They will probably not resprout from the lower part of the trunks, so how about disguising the bare trunks with something tough that will grow in the dry, dark soil beneath them. I'd try Euphorbia robbiae which is evergreen and had lime green flowers in early summer. Or use a variegated ivy, you can use the small leaved ones sold as house plants as long as you harden them off first. also, snowdrops or bluebells. With all of these you will need to enrich the planting holes with compost and water them well for the first summer.