Scott Otterson <scotto@u.washington.edu> writes:

[...]

+ expand matching pattern outwards until matching uniqueness is

assured across the whole file

This isn't foolproof as an identical line could be added later leaving
us with much the same problem.

+ store  line number

This actually is already possible, but not the default behaviour for
org-store-link.

Also, from the manual:

,----[ org.html#Handling-links ]
| If there is an active region, the selected words will form the basis of
| the search string.
`----