No not specifically. I just don't see any real chance of using balanced 3 phase heating with a single phase grid excited asynchronous generator without a lot of problems.
Using capacitor excitation lets the thing determine its own frequency and the exciting current from the capacitors will rise with frequency. The voltage for a given magnetising current will also rise with frequency so the thing might be able to track the load better. I still think it will be a difficult scheme to deal with and it wouldn't be my choice over a synchronous alternator especially as it will need gearing to a much higher speed for a low pole number machine.
Even if you can get it up to 50 or more Hz it will take a lot of capacitance I have never found capacitors to be the worlds most reliable things or the cheapest.
It would need a bit of ingenuity to keep the resistor loading correct. If the load is too small the magnetising current becomes excessive and it saturates the iron and heats the windings. Too low a resistor and it will loose excitation which may be even nastier.
I haven't looked at that diary entry for years so if you have left comments there, sorry I wouldn't have seen them. I will try to find it when I have time.
Flux