I made something kinda related to some other suggestions (1500000409862, 360050954934, 360050470331 and some other ones) which could be used to appeal for unban directly on Discord. The graphic design is based on the "Membership Sceening" one.
Here is an idea what it would look like:
When receiving an invite
In server settings
In ban appeal form tab
Hope yall will appreciate what I did! If you do, you can leave an upvote; this means much to me!