I found an external usb device that can take an iso file and present itself as an external DVD.
The device is based on the idea of the isostick.
http://isostick.com/I have an isostick, but use it for other operating systems.
The isostick would not work for OS/2 installs.
I found this device works for OS/2 installs - Zalman zm-ve350:
https://www.zalman.com/EN/Product/ProductDetail.do?productSeq=914I installed a 120GB ssd in the enclosure. I copy the ISO file to the device. Then set the device to be a DVD, and plugged the device into a usb socket. I was able to install with no problems.
The only complaint I have so far is the poor "jog button" interface to select options on the device. The manual is sparse and does not explain in detail this "jog button."
I use this device on ArcaOS, FreeBSD, Windows, and various Linux distributions.
I never have to make another DVD disk.