@whatamidoing here is the link:
https://www.fullalt.com/altyes-intro/

You will find that the AltYes browser extension will not only help you and anyone wanting to do exactly what your vision/plan is, but also add value to the post by being able to Write an intro as to why you are sharing an older post.

Likewise, if you share somebody elses post, you can simply adjust the beneficiary/rewards payouts to ensure the original author gets the due rewards.

Hence making your entire idea come to life easily and efficiently, without double posting the same content from before.

Please feel free to check it out, install it and if you have any question, don't hesitate asking.

The browser extension will soon be updated to meet the needs of all our fellow friends from our chain, so that it covers the needs of all of us, no matter if we are on Hive or on Steem or both. Give it a few days, but til then, you can get a feel for how this free tool can serve your needs and ideas here.

Cheers.

PS. thanks @snook for the shout out. Glad to see you are helping people 24/7, 365 days a year!