Improving Email Validation with Custom API Options

Hello Team. I have a question regarding Email Validation in your existing email waterfall. By itself it is already great but here in Belgium ( and Europe in general ), email validators such as BounceBan and other country specificsproviders provide better results that the one in your current email validator list. I was wondering if it could be possible to use a configurable Api as a "custom" email validators. I do not think it is currently feasible with the current "custom" waterfall. Thanks for the product and I would greatly appreciate your insights on this.