It's very easy but not straight-forward or documented anywhere.
First, install Wine 1.6.2. This version probably isn't required, but it's the version that currently ships with Debian Jessie and it works with VBScript.
Install Winetricks and use it to add the following libraries:
- wsh57
- vcrun6
Now you should be able to execute a vbscript:
MsgBox("Hello World")
wine wscript helloworld.vbs
To get SAPI working, install the following:
- sapi51 (you may have to obtain this without winetricks)
- speechsdk (MS Speech SDK 5.1)