Looking good Paul.
I've never heard of a Seagrape tree, but it sure has an interesting form.
Although the bark looks quite smooth, dare I suggest that you could also try attaching some broms to the branches as well?
In time, if the broms stay where they are, their pups might attach themselves to the branch behind. If you tilt the 'mums' on a slight angle away from the branch, their pups might form towards the branch. Might be the only training they need! Good luck.

Cheers,
Kerry

I grow broms and orchids on mine too
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Very very nice, junglegal! Your garden lives up to your name :)

Cheers,
Kerry