
Honestly? I think it's fine. I've seen quite a few RPers who apparently have the Echo in some facet, and there was a whole organization in 1.0 that revolved around finding and gathering up those with the talent. Even in the modern version of FFXIV, we see a couple folks besides the WoL who possess the Echo: Minfilia, Krile, and I think that Sahagin chieftain or whatever also had some aspect of it?
So, while it might be rare, it's not exactly "WoL-only" like some of the other things that people could claim - like being the Azure Dragoon or a non-Padjali White Mage. Plus, I believe it was mentioned somewhere that there are various different "versions" of the Echo that someone can possess. Like, the WoL's allows them to understand all languages and have those brief "visions" of peoples' pasts - but I don't think Minfilia had either of those and I think Krile's just allowed for language comprehension?
So, if you want to basically have a "Krile-style" Echo, which is what sounds like you're going for, you should be perfectly fine.
So, while it might be rare, it's not exactly "WoL-only" like some of the other things that people could claim - like being the Azure Dragoon or a non-Padjali White Mage. Plus, I believe it was mentioned somewhere that there are various different "versions" of the Echo that someone can possess. Like, the WoL's allows them to understand all languages and have those brief "visions" of peoples' pasts - but I don't think Minfilia had either of those and I think Krile's just allowed for language comprehension?
So, if you want to basically have a "Krile-style" Echo, which is what sounds like you're going for, you should be perfectly fine.