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For a secure/minimal set I'd just avoid sftp and it's client-commanded resource management. Just use plain scp, the protocol is very simple.

Funnily enough OpenSSH are switching scp to use the SFTP protocol https://www.openssh.com/txt/release-8.8

You don't even need scp if you go for minimalism. ssh and cat work fine (add tar on top for multiple file transfer).