As part of the Net::SFTP::Foreign
distribution you will find the adapter module Net::SFTP::Foreign::Compat
which exposes the same API as Net::SFTP
Just add the following line at the beginning of your script:
use Net::SFTP::Foreign::Compat ':supplant';
... and all the calls to Net::SFTP would be diverted to Net::SFTP::Foreign.
There may be some edge cases where the behaviors of both modules differ, but not in the most common cases. At least I have not received bug reports for the adapter module for a long time... though, maybe that is because it has fallen out of popularity, who knows!