Although I've never tried this product myself, I would one day like trying GTechniq C2V3 Spray.
Although $30 for a 500ml bottle, the description here on site says it is diluteable, so it is water based, and said that it can be used as a drying aid.
Being diluteable should also stretch the product making it less expensive per application. Sounds like it has similar properties-qualities to CP Reload, and GTechniq suggests that it is suitable over their coating technology.
Seems the biggest gripe coating fans may say about using unorthodox toppers over a coating is not so much the possibe alteration of looks, but the alteration of a coating's properties such as hydrophobicity, and repelling dirts-contaminants.
Of course when bought during a good sale here, the cost would be even less.