I imagine that if worse comes to worse, I can upgrade my motherboard to work with this #$%@ XE1541 cable I bought a year ago, so that I can write 1541 disks from the D64 images I've downloaded. THEN I can use a real Plus/4 to hack the 2.2 version and re-convert it back to English.
Expensive and a time-consuming process, wouldn't you agree?
There's no way I can do this before the end of the year, so if anyone comes across the original 1.13 release, I would be most grateful.