To Jax: thanks for both your responses.
I think that unless we have a generations long mesorah of levush (and even then…)what we have to emphasize is the need to daven “kempt” as opposed to unkempt – tucked in, laces tied. That is clearly understandable as kavod appropriate and necessary. If one’s son is doing that, and davening with kavana and sincerely, one is way ahead of the game.
When you ask someone experienced and wiser, make sure to include all details necessary – age, milieu, etc.
Rabbi Yakov Horowitz would also be a good person to contact.
May you, or whoever, see great nachas.