Restoring iPad

the only answer is that there is no way in the world you can accomplish it without the aid of a computer

if you wish to complain to apple that you can't then you can use

Feedback - iPad - Apple

if you wish to reach out to their official support channels then try

 Get Support (apple.com)

And or

 Contact

- Official Apple Support

And or

Contact - How to Contact Us - Apple

Or

Genius

Bar Reservation and Apple Support Options - Apple

These support pages outline the available methods to restore an iPad - either from a backup, or to Factory Settings:

Restore your iPhone, iPad or iPod touch from a backup – Apple Support

Restore your iPhone, iPad or iPod to factory settings – Apple Support

Restore all content to iPad from a backup - Apple Support

To do so, it is currently necessary to use either a Windows PC (with iTunes for Windows installed - or more recent Apple Devices App) or a Mac computer (with iTunes or Finder - as appropriate for the installed version of macOS).

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

Apple Devices App (Windows PC):

https://apps.microsoft.com/detail/9np83lwlpz9k?hl=en-ms&gl=MS

When an iOS/iPadOS device cannot boot to a running state, use of a Windows PC or Mac computer to perform the restore process is unavoidable. In circumstances where you have no access to suitable computer - either of your own or a helpful friend or family member - the technicians at the Genius Bar of your local Apple Store or Apple Authorised Service Provider (AASP) are able to assist:

Genius Bar Reservation and Apple Support Options - Apple

You should note that AASPs are often much closer to you than an Apple Store.

Apple invite submission of constructive comments and feature requests via its Product Feedback portal. If you would like to see Apple consider introducing additional methods by which you might restore iPad and iPhone devices, this would be the most appropriate channel through which to make your request:

Product Feedback - Apple

If you need to restore your iPad because it has stopped working or has been locked out or whatever the reason, then unfortunately there is no way to do it other than the options that you mentioned. I know this isn't what you want to hear, but it is the way it works unfortunately. I too myself live around 45 minutes from an Apple Store but that isn't really a huge deal if I needed to get something like that taken care of. The process doesn't take an extremely long time and if they can do it by just plugging it into a computer, they will do it for you at that time. Just make sure you schedule an appointment before you go in there. They are usually very busy.