I think the main problem is going to be the Sony hotshoe. I recently picked up a Sunpak PZ40 (nikon electronics) with standard shoe and a Sony to Standard hotshoe adaptor.
It only works in manual, but it only takes a few shots to get the correct settings. I paid £30 for the flash and here I think might be your biggest problem, the adaptor was only a few £ but from HK.
I also realised as I typed this I have a spare adaptor, it might even be one with the circuitry that allows you to use older flash guns with higher trigger voltages. I can't check at the moment as Ebay seems to be down. if it does not have the circuity, then you would need a newer digital compatable flash, hopefully I can check Ebay later on and let you know.
If you want this, PM me your address and I will send it over. You will then need to try and get hold of a standard hotshoe flash, it will need to be able to be operated manually and ideally have adjustable power.
Edit.
It does say it has circuity to protect the camera, but I have no way of proving that it works. You would have to accept the risk if it was used with an older flash gun. Here is the link.
http://cgi.ebay.com/ws/eBayISAPI.dll...m=170260041516