[PROJ] Finding not implemented projections

[Javier Jimenez Shaw]

Hi

Today I met "by accident" EPSG:3053
https://spatialreference.org/ref/epsg/3053/
looking for a westing-northing system.

I realized that the projection "Lambert Conic Conformal (West Orientated)"
is not implemented (all fine, I don't want it to be implemented).

What I want to know is which CRSs from the catalog do not have an
implemented projection, to avoid using them.
We are using "proj_get_crs_info_list_from_database" to get the list of all
the systems (13722). It includes the field "projection_method_name" (a
string).
Is there any function in C or C++ API to know if such a method is
implemented? Doing a quick search in spatialreference I see there are 53
methods in total nowadays.
I don't want to hardcode that list in my code, in case anything changes in
the future.

Thank you.

Cheers
Javier.
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