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I'm tempted to give a straightforward 'no'.
However, if the wall is strongly mortared together and is at least 8" wide at the top AND parts of the top course are perfectly level, you can bolt steel cups (boots) to the top and set posts into these. Trellis offers very little wind resistance. It would be far easier to build posts into the wall as you build it, about 5 courses deep should just about do it.
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You could fit posts to the face(s) of the wall and then fit trellis to those. Would need to use shims to get it centred and it might all look a bit ugly. But I would think definitely sturdy enough, especially as you only want a 2-3ft trellis.
ColinTheBald
Marron
@Polygon
Going back a few pages, regarding my garden wall I posted about, work has stopped for the winter while it's been way too wet/cold/dark to do much. Looking forward I'd like to fit a 2 or 3ft fence trellis above it for some extra privacy. Is there any way of doing this so it ends up in the centreline of the wall? I'm guessing trying to fix it to the top of the wall will pull it down with the first string wind.