You may want to set up a global variable with all of your default gpg parameters.
Examples:

our $GPG = qq|/usr/local/bin/gpg --no-version --comment "" --no-secmem
+-warning --no-permission-warning --homedir "./.gnupg" --no-tty|;
# List keys
my $cmd = qq|$GPG --fingerprint --list--keys --with-colons|;
# Delete specific key
my $cmd = qq|$GPG --delete-secret-and-public-keys 0x$Fingerprint|;
# etc. etc. etc.
#
my $Result = qx|$cmd|; my @PGPKeys = split(/\n/,$Result);
# Do something . . .
[download]

Move or delete the 'homedir' directory, and then use only perl script(s) to work with the gpg entries. I don't know if this will work with windows, but it worked for me on all versions of *nix I tested. All permissions will be set up correctly.

Hopefully, this will get you going.

Good Luck