Trouble removing spiral balance

Hi , i just got off the phone with your sales rep prior to orderings Balances & he recommended I email my question with photos to see if a solution can be recommended

I need to replace the Tilt Spiral Balance in my bathroom ( the other rooms have no obstructions) however there is a slanted wall that obstructs the opening of the Sash so I can't remove the window and have the shoes be in the locked position ,
The Sash can only be opened 7'' before the slanted wall obstructs it ,( photo attached )

Do you have a suggestion how I can replace the balance

My only thought was was to raise the Sash to the highest position, put a stopper to hold it there.
Then remove the 2 pivot -bars,
Remove the window.
Install the new balances
Install the Sash and raise it to the highest position again with a stopper
The shoe will not be accessible so I will take a hook of some sort, possibly made from a hanger , slide it between the Sash and shoe.
Grab the shoe pull it down several inches & then slide the pivot-bar into the shoe

If you another solution it would be appreciated

Would my suggestion work

Photos attached

Just figured I'd let you know it worked Thanks