Impact of order of bilingual dictionary entries, dictionary searching, and input method on Chinese learning
In most modern dictionaries, there is a preface that allows you to search words up by radical, by directing you to the appropriate page. Most people use this section when they want to learn its pronunciation and/or its meaning. 

Some old dictionaries like the Shuowen Jiezi or the Kangxi Dictionary (说文解字 and 康熙大词典 respectively) are all-radical dictionaries, which organize characters by radical.

In an online dictionary, there is a section dedicated to radicals, so it gets even more convenient.

One could also use Cangjie/Wubihua or similar to simulate this "radical-lookup".

Additionally, some dictionaries have a "first-5-stroke preface" that allows searching based on stroke order.

TL;DR: This has already been invented.