The very first OS for Raspberrypi used ARMel which uses software emulated floating point.
There was a Debian Squeeze image based on Debian ARMel which used software floating point and the "soft float" ABI.
The initial Raspbian was a port of Debian Wheezy and used hardware floating point and was adopted as the basis for all official OS releases. There has never been a Raspbian using ARMel.
No one would want to go back the old slow software emulated floating point.
"Raspberry Pi 0W v1.1, which is armv6, which is armel" is incorrect - there is no architecture which did not include hardware floating point. The Pi Zero W is a much later release from Feb 2017 although it uses the same BCM2835 SoC as all the early models.
If you could find one of the original OS they would probably run on Pi Zero W.
All the current releases of Raspberry Pi OS (except for the 64 bit versions) will run on all models.
You may find A Brief History of … Raspberry Pi OS interesting.