Here's what I've simply settled on:

# Remap S to move spam to the spam folder
macro index S "<enter-command>unset wait_key\n<pipe-entry>bogofilter 
-s\n<enter-command>set wait_key\ns=.Spam\n"
macro pager S "<enter-command>unset wait_key\n<pipe-entry>bogofilter 
-s\n<enter-command>set wait_key\ns=.Spam\n"

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