After months and months of hard work, I am proud to present a brand new set of resources: The Choral Musician Digital Workbook Series. This is the audiation-based sight-reading program you have been looking for. I sure know it's the program I have been looking for!
About the Series
To begin with, there are three books in the series to get you started:

Digital Workbook 1: Establishing an Audiation Foundation (macrobeats and microbeats in duple and triple; tonic and dominant patterns in major and minor)

Digital Workbook 2A: The foundations of reading (macrobeats and microbeats in duple and triple in 2/4, 6/8, 3/4, 4/4 and Cut Time; tonic and dominant patterns in major and minor tonalities).

Digital Workbook 2B: Reading stepwise scale patterns in major and minor tonalities.
Take a Look Inside
Before you buy, why not download the free sampler, and try it out for yourself in your own classroom? This will give you a taste of each of the workbooks.
Click here to download The Choral Musician Sampler
If you want even more of an idea of the contents of each book, I do a deep dive into each workbook with a walkthrough of the entire thing.
The Choral Musician WalkThroughs
Digital Workbook 1
Digital Workbook 2A
Digital Workbook 2B
Get Yours Today!
There are many buying options. Most notably, The Choral Musician is included as part of The Faculty Library subscription. So if you're a member of The Faculty Library, log in, and you'll already have this series at your fingertips to use with your choirs today!
For those interested in buying a bundle, or each of the workbooks individually, head on over to the main page to find out your options.
I hope you and your choirs enjoy these new materials! Feel free to leave any questions or comments below.