So it looks like netboot.xyz does internally use pipxe, and researching did 
help me find out how to build pipxe for RPi4. Here is a condensed version:

1. manually update all submodules, in `edk2`, `edk2-platforms`, `edk2-non-osi` 
and do `git pull origin master`
2. edit the Makefile, replace `RPi3` with `RPi4`
3. also in the Makefile, disable git submodule update as it will then revert 
the update (just comment the line `git submodule update --init --recursive`)
4. also in the Makefile, change `IPXE_TGT` to `bin-arm64-efi/snp.efi`
4. run `make`

The resulting EFI file seems to work OK on my RPi4.

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