Bump from long ago - In case anyone else hadn't noticed (I had not), SFTP is now available on the Meteobridge. I'm running 3.7 (Jul 20 2018, build 12257).
I noticed that my status page was showing very stale FTP data - because my host was no longer supporting FTP access. So I was pleasantly surprised to see the MB SFTP support there, and all works fine for me now.