Here is a new workflow:

https://github.com/r....alfredworkflow

You type "oa:install" to install a helper script into your /usr/local/bin directory. Make sure that directory exists, is writable by you, and in your path.

Then you can use these commands:

oa:terminal open the topmost terminal window in Alfred
oa:iterm open the topmost iterm window in Alfred

Let me know if this works for you.