Yet Another buffer question

Possibly the last buffer question for IBD 2026...

Suppose someone wants to use a buffer in a solution to some typesetting
problem which involves more than a simple \getbuffer or \typebuffer or
\typesetbuffer.

They could define something like

        \def\usebuf#1{...use buffer #1 as needed...}

and later do

        \startbuffer[mybuf]
        <content>
        \stopbuffer
        \usebuf{mybuf}

But this isn't in the spirit of the
        \startsomething
        <content>
        \stopsomething
paradigm.

How does one define a \start-\stop "environment" that
-> collects some content into a buffer, and then
-> does whatever one needs to do with that content ?

Thanks.
                                Jim
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