Only one thing came to mind, 7Knight's Synthesis feature. I won't say it is not impossible, but it's gonna take years for it to come because of our very small hero pool. Even with heavy fees, it's not gonna be easy as a 1-to-1 exchange.
Something like this is also fine, hmm years that is Long

Circumstances can change depending on how many people want to petition for it, it may come sooner or later depending on popularity. Also, if the Developers are going to pin it up as their priority, ultimately it is their decision whether they feel like implementing it or not after having their own discussion.