Vintage Flash Compatibility

I realize the NEX-5N isn't the best for flash photography. I also have other cameras with hot shoes that work well with flash, but I'm trying to find a universal solution that will allow me to use all my cameras with all my flashes.

The Vivitar 283 has a trigger voltage of around 268V. Some cameras and remote triggers might be able to handle that, but not all. To make sure I can use it with all the photography gear I will have during the life of the flash, I need something like a SM-512 (~$16) or Wein Safe Sync (~$50). The SM-512 is certainly cheaper, but it has negative reviews on Amazon, including one that specifically says it didn't work with a Vivitar 283:

http://www.amazon.com/SMDV-Adapter-Digital-Powershot-Hotshoe/dp/B004G47I7O/

http://www.amazon.com/SMDV-Hotshoe-Adapter-SM-512-Coolpix/dp/B004G4D1PC

Some of my cameras have a hot shoe, though the NEX-5N doesn't, and I may have cameras in the future that don't. Also, having off-camera flash is handy. So I need remote triggers. The Sonia Digital Slave Unit (~$29), Seagull SYK-5 (~$11), and SF-4 (~$36) all appear to work with the NEX flash. Any idea what voltage the SF-4 can handle? I've looked all over, but the only online results are a couple listings on UK eBay and they don't provide much information. I can't even find a company name listed anywhere.

So my cheapest route to using the Vivitar 283 would be a SM-512 (provided it works) and a Seagull SYK-5, for a total price of around $27. Or, I could just sell the Vivitar. The NEX is reported to work with Yongnuo YN460-II (~$44) and YN560 (~$63) flash units. I could probably get around $20 for the Vivitar, since it's in great condition and has some extras, so subtract $20 from the Yongnuo price and that seems like the best idea.

Really what it comes down to is the 268V. If the Vivitar didn't fry modern electronics, I would be inclined to keep it, getting a radio trigger set with the transmitter attached to a SYK-5. But with the added voltage problem, I think I'll dump it.