depending on your mechanical inclination, parts access and the like, doing a zetec swap could be an option. While that would get you off of valve drop watch, I don't know what reaction that would have with the all of the other problems mentioned. obviously any directly related to your engine would be gone/change since not same engine.
I understand your situation. My 03 SPI has been sitting in my driveway for the past 3+ mo as I figure out what to do with it.
"All that is necessary for evil to triumph is for good men to do nothing" - Edmund Burke