Just a quick follow up on this topic Controlling Spfx Bundle file name in production builds

It seems the latest drop of SPFx added a new setting that allows you to bypass the hash mechanism and prevent it from being added to your bundle file names.

I have yet to confirm this, but it seems you can add this code to you gulpfile.js:
build.copyAssets.taskConfig = { excludeHashFromFileNames: true, }

And this will stop adding the hash to the file names.

Posted: https://github.com/SharePoint/sp-dev-fx-webparts/issues/246#issuecomment-335946172
By: Franck Cornu
(Thanks!)

I will give it a try and update here if it works. See my other blog post on how to edit the file name and add the version number automatically as well.