Backdrop image to ignore Lumen - how to?

Hello,
So what I’m trying to achieve is simple , at least in terms of how I would approach it in offline rendering platform.
So in UE5 I create a sphere that serves as backdrop for my archviz environment , I apply an emmisive material to it. So far so good.
Idea is to have this sphere reflect on glossy surfaces, like glossy kitchen cabinets and so.
It blocks all sky lighting from Sky actor , setting VisibleToRaytracing off for the sphere solves the issue but removes is from reflections too.
I’ve tried all possible checkmarks, Cast Shadow off obviously does nothing as Lumen GlobalIllumination ignores it.
Any workarounds to have a visible object in camera and reflections but not occluding SkyLight ?

Thanks in advance

up please

Here is a visual, first image shows the proper GI from SkyLight but not reflections as my Spherical Background mesh has Visible in Ray Tracing to Off
Second image is the desired reflection but now we lose all the Gi from the sky, as the spherical mesh blocks the sky
Any Workarounds?