@RyPA and whoever else wishes to chime in...

Today my haze induced thoughts came up with a new plan.
According to Step 10. Dry hopping, of the recipe from brewers best:
10. Add dry hops
If you do not use a secondary fermenter then add the hops to your primary after fermentation has completed and leave for 5-7 days before bottling.
So I plan to put the hops in a 5 gallon keg, charge it with co2, do a closed transfer to the 5 gallon keg, wait a week and drink it.
My only question is at what point should I cold crash it? As soon as fermentation completes dry hop and continue or or wait until the 5 to 7 days elapse after dry hopping then cold crash or does it even matter? Also considering a pressure of 26 PSI where will the pressure be at 40 degrees F.? Will it drop to desired pressure or will I need to adjust co2 level after crashing?
Sorry for all the questions but how the blank else will I ever figure this out? LOL