Bliesma T25B in a commercially available waveguide?

Apologies if this has been covered somewhere (I have looked...). I've seen a fair amount of discussion of putting a Bliesma T25B in a DIY fabricated waveguide, but I haven't seen anything where someone tried it with the Visaton WG148 or the Monacor WG300 or another commercially available waveguide. Has anyone tried it? If so, what were the results?
 
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