I occasionally—for various reasons irrelevant to this question–take the front wheel off and rest the fork on the ground. Doing this risks damaging the fork.
Bicycles are shipped with a plastic object to protect the fork, and a chain keeper (see picture) will hold the chain while washing a bike.
Are there gadgets that will protect a fork while the front wheel is removed? A chain keeper might give extra strength to the fork by tying the two parts, but it will not eliminate the risk of damaging a fork resting on the ground.
If this is for use only inside the home, can you suggest something better than merely resting the fork on an old pillow?