So I went ahead and order the Spike-A flat Fielder from here:
I got the standard version to cover my range of scopes. C11 is my largest and I doubt I'll ever go bigger than that. I watch this video on youtube and it convinced me to try it.
So far I have not tried the dimmer, but I'm planning on moving on from the DSLR and I've read some CMOS cameras have a hard time taking flats if the exposure is too short, (I think it was the asi 294??) and I though with a dimmer on the panel I could just adjust it to what works well.
I tried a quick capture on my C11 at full power with my DSLR and got a 1/200 exposure on Av mode. I didn't really adjust the focus from the last time I went out so it probably does not mimic the focus I used when capturing lights. This was just a test anyway and I'll include a pic of the flat. I have a dark shadow at the top which is due to my OAG. We'll see how well this works out when I use in my next outing.
One thing I did not care for, there is some crud between the LED lights and the screen. I'll see if it makes a difference in the flats calibration. Might have to take it apart to clean it.