I tried this but I misjudged it. My watts went to zero and I got the do you want to quit screen.
Don't worry too much about timing TT, power into the dead stop if you want but once your in it stop pedalling, it's pointless you get nothing back.
You will find the Sim progresses you regardless and if the power has dropped of so does the resistance.
I think watching myself an Bill we always dead stopped in a slightly different position but it doesn't seem to matter so don't panic if your at the back.
Once you sense it has let you go stamp on the power again but like Bill says knock it down to a gear appropriate for the incline during your freewheel.
Luck for me I have a 32 cog on the back so my 50/32 works up to the 10% resistance limit any way so i just slam it into first during the freewheel.
Note when I say freewheel really power off but still rotate the pedals slowly so you don't get the quit message.