Self levelling cement that is compatible with going ontop of waterproofing?

I'm planning on using a microcement instead of tiling within the bathroom and have been advised that it cannot go directly over the floor waterproofing, it normally would go over a screed. Bit of an issue is I've already had plumber rough in thinking that I would using a self leveler, waterproof membrane and then the microcement over the top of that.
I'm trying to avoid going to a traditional screed as I believe minimum is thickness is 10mm, hence wanting something that is only 2-3mm thickness such as a self leveler but from what I understand they are not compatible with going over waterproof membrane. Is there a cement based self level that is?