Not knowing when the 21H1 MCT will be available, I just made this for now. :-)

Hi fg,
How did you make this ISO. Have you tried to use it? Does it install?
I have had no luck so far. Always an issue converting the wim to esd in wimlib56/57. I then tried letting dump make this ISO which it did (it still uses v56, not v57). Copied it to bootable flash, it would not do an in-place upgrade on laptop, reported error 0x8007025D - 0x2000C (Installation cancelled in Safe OS phase).
This normally means corrupt installation file or bad USB drive. Proceeded to try a total clean install from same ISO image to vm, same error. Deleted.
Then tried creating the ISO using install.wim, it did install ok in vm, so took the install.wim and tried to convert it to install.esd. Nope, ESD2WIM reports error in wim file.
Ended up doing the in-place on laptop using the RP image, successfully converted that install.wim to install.esd for flash card. Yep, I could of used the image and mounted but wanted to check the flash card.
Regards,