How to avoid regulatory approval regulations, when chosing a RF module?
Pre-certification may apply to the module you are using, but you are still required for CE marking of the device.

Part of the process for CE marking requires you to show evidence that your DEVICE conforms to the relevant harmonized requirements that covers emission and susceptibility.  

So you are still required to obtain CE marking to sell your product on the European market place, but you may be able to limit the number of tests you perform and not cover the intended radiator of your pre-certified module.  You will save some testing effort, but not all.