Yes, nosotros (which I havent' updated in months), it's getting completed now, just finishing media integration (kind 20 / 1111) because I really wanna use it, but it's a mainly kind 1 client, it also has a deck mode.
Discussion
Are you planning to keep only a few reactions for posts? I think having clients that support the entire emoji picker and let users pick freely is awesome. Ditto and NoStrudel are great examples, but I rarely see this implemented elsewhere. 
No, It will eventually be fully customizable + emoji packs, just need time.