Does "bu zei broda" work?
--
mu'o mi'e rab.spir
{bu zei broda} can be used anywhere, because zei acts before bu,
but you were close. The answer I had in mind was any brivla of
the form {zei zei <any-word>}.
For example:
zei zei lujvo fa lo selbri be di'u
The selbri of this sentence is a zei-lujvo.
But if we try to put something in front of the brivla
{zei zei lujvo}, we get:
lo selbri be di'u zei zei lujvo
which tries to attach the brivla {di'u zei zei} with be,
or:
lo selbri be di'u cu zei zei lujvo
The selbri of this sentence type of cu-zei type of lujvo.
which is just a sumti.
There is a way to cheat, however:
lo selbri be di'u cu zo zei zei lujvo
The selbri of this sentence is a "zei"-lujvo
which works because {zo} acts before {zei}.
mu'o mi'e xorxes
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mu'o mi'e xorxes
If it is, it is indeed a boundary case.
It is a brivla at least in parser terms:
"a. Token sequences of the form any - (ZEI - any) ..., where
there may be any number of ZEIs, are merged into a single token
of selma'o BRIVLA."
Also, for example in the rule
lerfu-word = BY | any-word BU
{zei zei lujvo} is a case of "any-word". So {zei zei lujvo bu}
(but only at the beginning of text!) is a lerfu-word.