I now have an ATxmega192A3U on a Schmartboard EZ (thanks Bob for the link). Since this is a 3.3V AVR and I don't have a level shifter, I am looking for ideas on how to connect to it. I'd be happy to have avrdude get through to it at this point.
The programmers I have at my disposal are Arduino as ISP, PonySer and USBtinyISP. Only the tiny might be useful to me at this point, as I can power it from 3.3V instead of USB and hope that tiny85 will run adequately. The other two options will likely fry the xmega with 5V output on the SPI.
A simple method might be using two resistors, a 5K in series with the 5V pins and a 10K pull-down after that and replicate this setup on MOSI, SCK and RESET.
I would very much appreciate some ideas on how to proceed safely. Thank you very much