You can definitely put the polite loading functionality into an ‘On Scene Load’ function. Basically what would happen is your Tumult Hype document would load, and when the first scene is loaded, a function can be called which then continues a timeline or starts your ad. Here’s a bit more info about this workflow with a sample document: Howto: Deploying Hype animations to DoubleClick Studio
Staying under the 100kb initial load depends on what you’re doing in your document. You may need to load multiple documents to stay under this limit, but Gzipping your JS from your server will help keep this number down.