OK M...
Already spent...
Finished chores early so here is another version (no preview) with tabs that works on the active layer only - no matter what the name of the layer is.
It currently lives in Filters>>Alpha to Logo
If you like it then you can add a preview and that should be job done. As a bonus this one also updates the deprecated curves spline pdb call.
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The attachment Active_Layer_Bevel_Reflect_BRL_1_6_V_111_Tabbed.zip is no longer available
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Did I mention that I also have an update for Metallic Filters?
Sure would like to test the new metallic plug-in.
Tested your BRL and got great results on the same gradient image.