If you do a trial of clomid and your testes do not improve and T levels become useful, a restart is probably impossible. You could do hCG for a while first to take the testes to a longer point in recovery. If T is not decent then, no point in going forward. Then stop hCG, start clomid and see what then happens with testes that are already physically recovered. Clomid will test out the top end of your HPTA.
Testes should be larger and firmer with hCG, and hang better. Recovery takes time.
Clomid has big side effects for a few. In that regard, the SERM nolvadex is safer and effective.