Combine x86 and x64 WinPE images into one

Hello. I have successfully created two WinPE ISO images with Win10PESE, one x86 version and one x64 version.

These two images were tested with VMWare Player and they worked fine.

I would like to have one single combined ISO image out of these two, such that:

1. Only booting from UEFI needs to be supported.
2. When booted on PC with x86 (32-bit) UEFI firmware, the x86 version of boot.wim is booted.
3. When booted on PC with x64 (64-bit) UEFI firmware, the x64 version of boot.wim is booted.

Is it even possible to archieve this? Any pointers are welcome.