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There's no workaround that I know of.
We have an open ticket for adding trace_sets to the Render Geometry Settings.
Hey all,
Solaris trace sets now work as expected in the latest HtoA release (6.2.5.1), you can find it at the bottom of the visiblity tab in render geometry settings - https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_for_houdini_solaris_ah_Render_Geometry_Setting...
Thanks!