Here are a few thoughts on your proposed crowdfunding campaign ideas:

Crowdfunding multiple similar products under one campaign is certainly possible on most platforms, like Fundable. It's not an unusual approach. Just be clear in your campaign description and reward tiers about the different products and bundles available.

Offering product bundles at discounted prices is a common and effective crowdfunding strategy. Having lower price points, like $3 per eBook, also helps lower the barrier to entry for more backers.

Running sequential campaigns to release additional titles over time can work well. Just be sure to fulfill the first campaign fully before launching subsequent ones to maintain trust with backers.

Consider packaging related titles together thematically to create natural bundles. For example, a bundle of three sci-fi eBooks vs. a random assortment. This helps the offerings feel more cohesive.

Make sure to have clear delivery timelines outlined for your rewards. Digital products like eBooks should have a relatively quick fulfillment window.

The key aspects you described don't seem unusual at all for a crowdfunding campaign on Fundable or similar platforms. If anything, you're leveraging proven crowdfunding strategies that can help optimize conversions. Just be sure to clearly communicate your plans and fulfill rewards as promised to build a good reputation over time. Let me know if any other questions come up!