Syntax keepend/oneline vs. extend

Quoting the help for :syn-extend :

The "keepend" behavior can be changed by using the "extend" argument.
When an item with "extend" is contained in an item that uses
"keepend", the "keepend" is ignored and the containing region will be
extended.

Fair enough, but how does one get the opposite behavior? I.e. what I want
is "keepend-but-seriously-stop-here" regardless of whether contained items
use extend, or match the newlines, etc.

(Context: including portions of one syntax in another, where the former's
use of extend doesn't anticipate the latter. I haven't found any
obviously right way to do this in either the help or the runtime files
that ship with Vim, only workarounds for specific cases.)

-Rob

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