Andy. I'm working on 3D printing some brackets to test on my system to add one or 2 bulbs on each side of my light. The rms is more than capable of holding them(I have rigged them into place to test weight). The issue is aesthetics. I plan to paint the back of the reflector satin black to match. I also plan to use the black German push fit waterproof end caps(sold on eBay). They are very sleek and I don't think they will look too bad.
Unfortunately I'm also caught between just switching back over to full t5 or staying with radions myself. I found a heck of a deal on a ati 8 bulb for my new system that is drawing me in that direction. It's just hard to imagine going back to changing bulbs so often.