The best replacement for downstem is stemless.

The best alternatives to downstem are rated as following:
★★★★★  stemless
★★★★  diffuser
★  showerhead

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Speaking about downstem, one probably shouldn't forget about ash catcher.

Other search terms related to downstem and their ratings are:
★★★★★ ash catcher
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downstem
stemless
diffuser