Printing pages to different feeds (pdf) WINDOWS

Question

We are currently sending out letters that print:

1. Letter on letter-head (customized for recipient)
2. Instructions on regular paper (customized for recipient)

These letters are all sent automatically in a PDF, so the PDF pages look something like:

1. Receipt 1's Letter
2. Receipt 1's Instructions
3. Receipt 2's Letter
4. Receipt 2's Instructions
5. etc...

We are sending these out daily (and will usually send to roughly 20+ recipients) and I would like to know if there is a way to print the Letters and the Instructions to separate feeds on a printer. It might be okay in the long run to continue printing 'odd/even' pages to separate feeds, but it's possible that more pages will be added, killing the odd/even method. That and I want to make this as simple and fast as possible for those will be doing the actual printing.

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Potential Solution:

I found this post: Printing: Different pages from different feeds (pdf). This is similar to the solution I need, but uses shell scripts. I am going to attempt to see if I can learn batch files and get them to do something to the shell script. But this needs to be something a person with enough-to-get-by computer-knowledge could use (maybe there is a program that does something similar?).

If anyone has

• a better solution (some known software perhaps)
• a batch file one is willing to share
• some info on printing from different feeds using batch files
• other useful information

it would be appreciated to have/hear.