[users] Questions about using a custom (non-system) perl

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Greetings;

I want to install LSMB on my server. I have a small amount of experience 
installing Perl scripts. I have installed both FosWiki and RT behind 
Apache via fcgid, but I still have a few Perl related questions.

Here is where I am so far:

1 - I have installed the latest Postgres (9.6.2) from source, the system 
(CentOS V7) doesn't have the required version (9.4 or newer) in it's 
repo (it has 9.2)

2 - If I install LSMB in the default manner, I end up using the system 
Perl, and cpanm installs modules listed in the cpanfile in the user's 
home directory. I do not want to use the system Perl, and have already 
installed a separate, Perl 5.24 instance that I use for Request Tracker 
and FosWiki. I have installed local::lib and cpanm as modules in the 
custom Perl 5.24

3 - My system Perl is 5.10 and the cpanfile calls for Perl 5.14

4 - There is an instance of Perl 5.10 in the home directory of the user 
account that will host LSMB (probably because I have CageFS on this 
server). So installing Perl 5.24 modules in the user's home directory 
won't work.

5 - My understanding is that by default, cpanm installs modules in the 
user’s home directory.

6 - I’m confident I can tell cpanm to install the modules somewhere else 
(<ledgersmb-root>/lib/cpan).

Questions:
A - how do I tell LSMB to look for modules in <ledgersmb-root>/lib/cpan 
? (I think I can use the statement "use Local::Lib 
<ledgersmb-root>/lib/cpan" but where would I put it?

B - how do I tell LSMB to use the non-system Perl?

C - In FosWiki and RT, I use a script (from stackoverflow.com) that 
changes the shebang statement in all Perl files. Would that work for 
LSMB? (there are no shebang statements except in cpanfile).

Thanks in advance!
Paul
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