POCO requires no support if the attachment point is 30" or less above the roof for 2" rigid conduit. They don't require bracing at all. It's just my inspector that is requiring the bracing because he goes by the weatherhead. Which irritates the heck out of me because as a mechanical engineer, I know that the physics of the pole beyond where the load is applied is irrelevant.
If I had to guess, which is my only option until Weds., his reasoning may be that if I have another 12" of pole available (which I do) then somebody at some future date could move the service attachment up, resulting in the attachment point being above 30".
That being the case, the fact that bracing is unnecessary makes the strength a consideration of secondary importance. The real primary function of installing bracing is that, by attaching it at the service attachment, it keeps the attachment from being moved on the pole.
I guess if I think about it that way, I can also see why guy wire wouldn't serve that purpose since it should be installed with a turnbuckle and hence it could be readjusted in the event somebody wanted to move the attachment point.
I'm probably also overthinking this, but that's in my nature as an engineer.
On the question of EMT being approved for use, I did a search and this was discussed on Mike Holt's forum and their consensus seems to be that EMT without wiring is not covered in NEC. If there is no electrical involved it's just metal tube.
0.042" wall 3/4" tube I believe, which should be able to handle 1500 N of force or 337 pounds. (not sure what grade of steel is used for EMT, so I used the lowest available grade for my calcs) POCO says a 2" riser supports a maximum of 750 pounds of loading. I'd be using 2 pipes in a V for support bracing, so I'd practically be able to support the load with the braces. The braces would never see that load unless the anchors pulled out of the wall, and those are rated for more load each... Geometry plays into it, the bottom line is I could justify not needing the braces to carry load at all.