The Broncolor Para -FB is a very nice system especially when coupled with the Broncolor ringflash. I invested into it myself last year when Calumet had a 20% sale drive on the Para. Since I´m shooting with Profoto I had Silvinos Pro Flash in Hollywood convert the Broncolor mounting into a Profoto 7 adapter. It works really great and I´m positive this will work for Elinchrome as well. I have tried to put Profoto´s own heads and ring flashes but the result is just not the same. The light tends to be very uneven at the edges compared to the center.
The only drawback with the Broncolor ringflash (besides the price) is that they are using a UV-coated circular flash tube that gives a warm light (4800 Kelvin) so you´ll probably need to put a cooling filter on it to balance it with your original Elinchrome heads. I have tried Briese and Profoto in the past and I think the Brocolor is a happy medium. Good luck!
The extra protective dome that came with our Para is a warming dome. From what I can determine, it's for use with non-UV Pulso tubes, so it wouldn't have anything to do with the Ringflash anyway.
But the original Ringflash did not have UV tubes, and the new one does. What does that mean. Well, I don't know for sure, but getting a 4800 temp reading with a ProFoto pack converted for use with the Bron Ringflash could be the result of a number of factors - which pack, what power setting, etc.
Even on the Bron packs, depending on the setting, you could have a variance as you dial up or down, unless it was the Grafit, which has tighter tolerances and allows you to control that color temperature.