If you are tight on space and short on cash have a look for a Rodney Milling attachment for the Myford.
http://www.homemodelenginemachinist....ad.php?t=22043
Small and fiddly sure but a step up from the vertical slide.
Alas they are hard to come by.
However if the concept of how it works will do the job for you you might be able to find some other type of small milling head to bolt to the tail stock end of the bed and use in a similar way.
http://www.lathes.co.uk/staines/
Something from a very small mill drill for example.
I know Maximat made a 4 speed milling head with a 2 morse that bolted to the back of their lath bed in the middle that worked in the same way.
All depends on what you can find.
Might even be able to modify a small drill press to do the job.