A very interesting topic for a potential guard located in Australia, one of our local guards has a set of what look like earphones he wears around his neck that blows air into the bucket, they're all over Amazon and Ebay, may have to invest after the build

Interesting technique to gain room, I also am a 6ft plus potential guard, luckily the (unknown maker) fibreglass bucket I have has a poor quality paint job I am intending to update, I may attempt your method, with far less risk!