I wonder, instead of cutting the dip tube, could you turn the keg upside down, switch the posts, then push the beer out of the gas-in post when the clearing is done?
I agree, secondary fermenters, are really just bright tanks, and the Dave Miller reference of transfering to a secondary after 12 hours is equvalent to dumping trub from a conical.
If I wan't to know if I should be doing something to my beer I look at what my pro-brewer friends are doing and then see how I can mimic that in my process.