I would recommend you to try to install Debian using virtual machine, installing it from the patched ISO files: https://bitbucket.org/ValdikSS/debian-iso-fastinstall/srcHi. I'm writing here to share my experience with eatmydata in the debian-installer. I was installing Debian 10 on a USB stick. The PC has a USB 2.0 port and the stick's writing speed is about 4.6 MiB/s. I did not measure the installation time precisely, but I'm sure it took at least 6 hours to complete with an LXQt desktop and an Apache server. I installed manually eatmydata, libeatmydata1 and eatmydata-udeb on the installer's filesystem, by extracting the contents of the archives to their right locations. I do not remember using anna-install to install the udeb, I don't know if it would make a difference. Also, I used the normal DVD-1 ISO image, without eatmydata in it.
Already patched ISOs are available here: ftp://serv.valdikss.org.ru/Downloads/Linux%20ISOs/Debian%20ISO%20FastInstall/
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