How to get a permanently invisible armor stand without cheats
Solution 1:
I have no way to verify this (I don't play on Bedrock Edition), but this seems to be one of those things that isn't possible in Bedrock Edition because of the lack of support for most NBT data. You need to set the Invisble tag to true, but that tag doesn't exist in Bedrock Edition. Additionally, in Bedrock Edition you're limited in what poses are available for armour stands, whereas in Java Edition you can pose each limb individually.