Distribute Unreal .exe application on website

Hello, I created a staircase configurator for a client with Lumen, it is an .exe application
My client wants to distribute the application on his website, the problem is that his site can receive up to 30 visitors per hour.
The pixel streaming cloud system is therefore too expensive, how can I broadcast my .exe application to so many people at the same time?
A conversion to webgl? or another solution?
Thank you so much !
(I’m using UE 5.2.1)