Answer: The dryer vent will pose some problems unless you can somehow deflect the heat. Neither shrubs nor vines will appreciate the blast of hot air. If you can deflect the heat, you might consider growing wisteria, Akebia, evergreen honeysuckle, Carolina jessamine, Evergreen Smilax or Confederate Jasmine. All will grow in part to full shade so they should adapt to the sunshine exposure you describe.
If your crepe myrtle looks healthy, it is getting enough water, despite the heat. Non-blooming can be attributed to immaturity (it can take a year or two to become established in your landscape), or it could be that it needs to be pruned. Crepe myrtles bloom on new wood so pruning in the early spring, just as it begins to leaf out will encourage the growth of new (and hopefully) flowering wood.
Best wishes with your landscape!
Q&A Library Searching Tips