I agree, this seems fairly unique. But, on the other hand, quite a few suttas have fairly unique approaches to various things, so it might be a mistake to read just a few suttas (such as Anapanasati and Satipatthana Sutas) and elevate them to the "standard".
This particular suttas does have some relationship to the usual Gradual Training suttas such as: http://www.accesstoinsight.org/tipitaka ... .than.html
where the pattern is
Virtue, Sense Restraint, Mindfulness and Alertness, Abandon Hindrances, Do Jhana, Have liberating insight.
In the current Sutta we have:
Do Jhana with Brahmaviharas, Develop insight through satipatthana.
A while ago Dave mentioned a Gradual Training Sutta that specifically mentioned satipatthana, but I can't find that right now. Perhaps he'll come along and help me out...