Thinking about Rewards for Lifetime Support (Patreon)

Currently I am thinking about creating at least one reward that is based on your life-time support. There are several reasons for this, 1) I am aware that some people can only give 1 $ per month, yet do so for a long-time, 2) some people support for limited amount of time, yet with larger sums, yet once they "leave", they don't have access anymore. As such, I thought about providing a reward that can also be received by former Patreons.

My main idea right now is, to create a small series of videos on "Military (History) Basics", like the "Tactics, Operations and Strategy" video that are in my opinion absolute crucial. Yet, usually not well received by the larger audience. Probably around 5 videos for the first series and then provide each supporter that reached the threshold with a link to the videos. Yet, I am also open to other suggestions, so let me know if there is some form of content or service (I know some like to play games with me, although I have no idea how many) you would be interested in.