This model cannot hold a bicycle. For a multi-purpose solution, consider the bike carrier (https://www.galaxus.ch/fr/s3/product/thule-velospace-xt-3-porte-velo-7865061) with the box accessory (https://www.galaxus.ch/fr/s3/product/thule-backspace-xt-cargobox-porte-velo-7865051).
But it will be more expensive!

No. Is permanently installed.

Not possible as far as I know. Ev check on the thule homepage