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I imagine it won't be possible to configure it so that your SSO is saved indefinitely. The article you linked to shows that this has a 3.5d timeout by default.
As you mentioned, however, this kind of timeout, combined with an autofill feature, should still allow for a pretty painless login experience. You mention you're having issues getting the credentials to save? Can you describe the behaviors?
KB01228 specifies that you must be running iOS 11, so I'd double check that your iPad is up to date on its software upgrades. If it is, are you able to access the feature as desribed in the article (iOS Settings => Accounts & Passwords => App & Website Passwords) ?