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IMO consider a yogurt instead. Use a table spoon with a very thin layer of butter, sprinkle with material (ideally keef) and heat from afar with a lighter, you will see it dissolve, then stir into a yogurt.
0.5g hashish or 1.0 herb would be a high dose for me, obviously ymmv.
If it must be...
I like the concept of removable stem, but then the joint would have to be quite large, maybe at least 29.2mm to accommodate the proposed shower head...
imho fixed down stem better suits this type of bubbler for that reason, the diffuser being wider