Use WP-CLI remotely over SSH on web host Strato

Strato half-secretly has decent SSH access even for its cheap plans, but it comes with quirks. To use WP-CLI comfortably,  I jumped through these hoops:

1. I recommend we set up key-based, password-less login
   ssh-copy-id yourdomain.com@ssh.strato.de
# or
ssh yourdomain.com@ssh.strato.de
mkdir -m 700 ~/.ssh
touch ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
vim ~/.ssh/authorized_keys # paste your ~/.ssh/id_rsa.pub here
2. I recommend we create an SSH alias
   # local ~/.ssh/config
Host strato
Hostname ssh.strato.de
User yourdomain.com
ServerAliveInterval 30
3. Install remote wp-cli (make sure we have it locally, too)
   ssh strato
mkdir bin && cd bin
# check wp-cli.org for up-to-date command!!
#curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
4. Create the “wp” alias on the remote machine
   Find php-cli
   /usr/bin/php -v
# PHP 7.2.17 (cgi-fcgi) # wrong!
/opt/RZphp72/bin/php-cli -v
# PHP 7.2.17 (cli) # here we go!
   Check the remote’s default shell & $HOME
   echo $SHELL
# /bin/tcsh in my case!
echo $HOME
# /mnt/webr/01/23/456789ab/htdocs
   Set up the alias
   #.tcshrc
alias wp /opt/RZphp72/bin/php-cli /mnt/webr/01/23/456789ab/htdocs/bin/wp-cli.phar
set path = ($path /usr/local/bin $HOME/bin .) # can be handy!
#.bashrc
alias wp='/opt/RZphp72/bin/php-cli /mnt/webr/01/23/456789ab/htdocs/bin/wp-cli.phar'
PATH=${PATH}:${HOME}/bin # can be handy!
5. I recommend we set up a local WP-CLI alias:
   #~/.wp-cli/config.yml
@strato
ssh: strato/mnt/webr/01/23/456789ab/htdocs/path-to-your-wp
6. Test!
   wp @strato
wp @strato --info
wp @strato post list
# go back? debug?
wp --ssh=strato/mnt/…
wp --ssh=yourdomain.com@ssh.strato.de/mnt/…
ssh strato wp
ssh strato /opt/RZphp72/bin/php-cli /mnt/webr/01/23/456789ab/htdocs/bin/wp-cli.phar
#etc.