A new polished deepslate and polished tuff obtainment

Hello, Mojang. I'm here with a suggestion for a new polished deepslate and polished tuff obtainment, this suggestion is mostly made because of the current state of getting deepslate and tuff related blocks on default superflat worlds, they are not obtainable. I really like superflat worlds, in my opinion the biggest problem about them is that there is no way to get these blocks, and since they are a very good blocks for building, it's kinda painful to not be able to get and build with them in our superflat worlds.

MY IDEA:

In my opinion it could be a very good addition to the game, if polished deepslate and polished tuff would be obtainable through trading with Mason Villagers, there could be a low chance (maybe around 10%) for one of these blocks to appear as an offer on the Journeyman Level for a bigger price than the rest of the polished blocks, it's also connecting to the lore well, since Mason has all the base polished stone variants, and they are quite easy to get, he sells them for a cheap price, deepslate and tuff is harder to get due to the Y level, it's harder for him to get them, so he sells them rarely, with a higher price (maybe something like 8 emeralds for 4 of these.

Even if it's not going to be added, thank you for reading my suggestion, it means it caught your attention and I might have some better suggestions next time.