iPad is designed as a personal device, capable of using one Apple ID account for the services. It is not designed for switching accounts. Signing out and in with various accounts may disrupt services.
Apple TV+ is a subscription that is tied to an Apple ID account. Using a different Apple ID account wouldn’t get you access to the subscription content.
Small family groups may share certain subscriptions (including Apple TV+) through Family Sharing. If you have that already, then you would have access through either account, although one is the actual subscriber.
See your subscriptions overview for this Apple ID account - Apple
About Family Sharing - Apple
What you can do with Family Sharing - Apple Support
Set up Family Sharing - Apple Support
Add a family member to your shared subscriptions - Apple Support
One user in the group would take on the role of Organizer, and invites the other prospect group members, each by their own Apple ID account. Have them each create an account, if they do not have one yet. This inviting should be done on the organizer’s iPhone, iPad, iPod Touch, or Mac. The people that receive this invitation then choose to accept or decline. That’s it, then the Family Sharing group is established, and then the shareable subscription content will be available to all group members. Then each of the members get access through their own account. The subscriber and the organizer do not have to be the same person.