Check out the Microchip/Atmel ATF15xx series. They offer a conversion utility from Altera POF to JED files to program their devices.
See: https://www.microchip.com/design-centers/programmable-logic/spld-cpld/tools/software/pof2jed and associated App notes.
According to Microchip the ATF1508ASV-A100 (current production device) replaces the EPM3128ATC100 and is supported by POF2JED
Just wanted to say that for our application, we replaced EPM3064ATC44-10N with Microchip/Atmel ATF1504ASV-15AU100 using the POF to JED conversion utility, ATMISP software, and the programming cable ATDH1150USB.
Our application was not running at very high speed, so even with the difference in speed grade of the devices, the application still appeared to work correctly, at least with just functional verification testing.
Thanks for the good lead @ak6dn .