Where or how to program EPM7064LI44

You are correct in that the 7064LI device is 'qualified' for operation over the 'industrial' (I) temperature range (-40'C-85'C) vs the 'commercial' (C) temperature range (0'C-70'C). I devices also have a +/-10% Vcc tolerance vs +/-5% for C devices. In reality however the physical devices are exactly the same, just tested and marked differently by Altera, depending on how fast they run. So in practice a -15 (slowest) speed grade I device can be replaced by a faster -7 or -10 commercial device and operate as expected.

The EEtools programmer and PLCC44 adapter will be required if you want to program either the Altera EPM7064 or the Atmel/Microchip ATF1504. So a good piece of equipment to have.

Personally I would pursue a dual approach. Continue to search for Altera EPM7064LI44-15 or EPM7064LC44-10. However I would be cautious about sourcing parts (thru eBay in particular) from offshore vendors (particularly China). There is a thriving industry in counterfeit chips, taking bogus or untested or fake parts and remarking them like originals for sale. Caveat emptor.

That being said, the cost of pursuing the ATF1504 approach thru DigiKey (or Mouser or Allied) for quality new parts and having them programmed by the vendor will be minimal. These devices go for less than $5 in small quantity and the programming charge for a lot of 10 say should be reasonable. I would probably do that anyway to have it in my back pocket. Example part: ATF1504AS-10JU44 is an industrial rated part equivalent to the EPM7064LI44-10.

You could download the POF2JED tool now from Microchip and test it out to see if it thinks your POF file is OK. No $$ cost as it is a free tool.

Ultimately given you have the AHDL source for the ALtera part it could be converted to CUPL source for the Atmel/Microchip WinCUPL tool, allowing you to produce a .JED directly, rather than using POF2JED. That would take a significant more engineering design work but could be done by someone experienced in the process. This might be necessary to do if for some reason programming parts with the POF file (or converted to JED file) you have do not work as expected in the equipment.