There's a huge different between having the raw knowledge available and simple step by step instructions.

A book created for this express purpose would be an order of magnitude more useful than any number of encyclopedias or even entire libraries. A big challenge would be even knowing what to research--if you don't have the next technology, you may not even know what it will be.

The biggest obstacle is really distribution. What you'd need its a government, church, or NGO to put a copy in every branch or something.

Maybe you could donate a copy to every prison library. Prisons would actually be a really defensible location to stay post-societal collapse . . .