Calling "gpg --sign" with loopback pinentry in some scenarios, but not always

Hi.

I'd like to use gpg loopback pinentry mode when signing commits
or tags through Emacs/Magit but default, non-loopback pinentry
for all other cases.

In particular, configuring "pinentry-mode loopback" in "gpg.conf"
is not really an option for me.

It seems that "git" does not have any hooks to pass arbitrary
additional parameters to "gpg", right?  So my only reasonable
option would be a Emacs/Magit-specific "gpg"-wrapper that adds
command line parameter "--pinentry-mode loopback" to the wrapped
"gpg" executable.

Any other options?

Thanks!