Hi there,
We’ve discussed this a lot, and while it is possible it is — 9 times out of 10 — not trustworthy with many websites. Which is why we have gone this route. There’s A LOT of reasons why modern browsing shouldn’t be negatively impacted by this issue, but in case you’d REALLY like to do this, here’s how I’d suggest you go about it:
1) Dequeue all our scripts and styles. We have a pretty useful article on doing that here: https://wordimpress.com/removing-styles-scripts-from-your-wordpress-parent-theme/
2) Register our scripts and styles with your own unique handle. This will make them available globally but not enqueued at all.
3) Use the conditional is_post(ID) to enqueue our scripts and styles only on the pages you want them to be enqueued on.
Hope that’s useful for you. Thanks!
