After dropping the nap my DS has still never done more than an 11/11.5hr night...12 or 13hrs, I wish! As an infant and toddler EBTs also never worked for him because he never tacked on, so an earlier bedtime just meant a 5am WU...so I completely get your hesitation as it would seem like our LOs are similar. That said, we can reasonably do a 8pm BT and get a 7am WU and if absolutely necessary do BT a bit earlier. He very rarely settles right away though no matter what time BT is and he just plays quietly in his bed for a while.
So I'm with the other ladies in that bedtime should move forward, but you might end up like us where something like 7pm is never going to work...we pretty well stick with 8pm, 7:30 if he is shattered.