M-n and M-p are for the history list. M-n already pulls the default value
into the minibuffer and adds it (possibly edited) to the history list. This
is enough connection between the two.
In this case, you seem to want the default value to be the _previous_
history value (so that empty input "searches the same thing again").
Yes, that's what the default is now.
This
means that M-n, M-p, and empty input will all do more or less the same
thing: use the last (i.e. previous) history value.
Each of them follows a convention. In this case, all three conventions
converge.
However, you might consider giving access to a list of "default values"
(more than just 1 or 2) via _different_ keys from M-n and M-p - the arrow
keys, for instance.
Finding other keys would be difficult.
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