NZB imports.
Right, which goes back to what I originally said.
When you download on the first system, the NZB Filenames are being used to rename the obscured files. When you use these NZB's to generate a NEW NZB with a generic name, you strip this filename information out. It's not included in the new NZB. Neither is the download or unrar path settings.
Why aren't you just using the source NZB's on the second machine instead of loading the NZB's on the first machine then generating a new NZB? Your current mechanism, using a single generic NZB to transport the information from multiple NZB's, is stripping the filename information out before you feed this NZB to the second machine. Basically it's not going to work for you if you want obscured MKV filenames to be renamed.
You could use "$(SUBJECT)" or "$(RAWSUBJECT)" in the unrar path on the second machine if all you care about is a pointer to the real filename,
You're better off copying the source NZB's to the second machine but how you choose to download is your business. I can only offer advice.