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Depending upon which expert you ask, the ATNR can "integrate" in as early as 4 months, or as late as 6. The fact that one persists at 7 months isn't such a big deal provided that it's not a constant ATNR and that he has bilateral hand play in independent sitting.
If you place the child in prone and work on reaching for toys from prone elbows and runner's stetch --- in absense of any neurologic problem --- it's likely to go away in 4 weeks or so. Help facilitate prone to sit and sit to prone NDT style from the sternum (try Lois Bly's book if you need help, or I'd be happy to e-mail you a few pictures).
Sounds interesting - I have found theat children can 'use' the ATNR if they are 'looking' for stability, it enables them to fix- especially if their core stability is lacking. So Id do lots of work in prone over a wedge/roll to encourage weight bearing through the UL's and head/trunk contol.
I would also work on changing positions - facilitated rolling, transfering from supported sitting to lying etc, moving in and around their base in sitting, encourage lots of playing with feet in supine to work the abdominals.