I'm currently using Yinhe Moon with orange sponge. For my backhand, I'm thinking of Andro Hexer Grip SFX. What do you think of Glayzer for forehand and Hexer Grip SFX for backhand?
I'm a fan of Glayzer. Normally I would say it's probably too hard to play well on an old 5-ply like the Samsonov Alpha, but that is a slightly harder blade and I don't know your level or physical ability. It may be fine, but coming from something softer like EL-P you might find it harder to engage.
On the other hand, Hexer Grip SFX is
very soft, about the same as Rakza 7 Soft. It'll play fine on a 5-ply all-wood, nice and controlled, but I've seen a few comments that it has a low throw angle. The original Moon comes in Soft and Medium which I think are 34° and 36°, respectively (~42° and 45° ESN). So a little harder than Hexer Grip SFX, but still only medium-hard.
If the Moon feels too hard for you, you can try something softer like the Hexer. But if you like Moon's hardness, softer rubbers will feel mushy. I don't know about Türkiye, but here the Hexer is still almost $50 and at that price you can get better/newer rubbers: Nittaku Fastarc C-1, Andro Rasanter R42 (a personal favorite), Stiga Mantra S, even Rakza 7 Soft.