Ways to handling specific html tags instead of combobox generated span tags

Hi, 

My aim is to create "complex" combobox items like we can see in this example : http://adresse.data.gouv.fr/map/ 

The generated column are well modified using css tricks. 

So i tried to look at custom component connector described in doc, but I understand, that the generated client object for comboboxes items is a VFilterSelect wich use this code for render items captions in td/tr 

@Override
public String getDisplayString() {
final StringBuffer sb = new StringBuffer();
final Icon icon = client.getIcon(client
.translateVaadinUri(untranslatedIconUri));
if (icon != null) {
sb.append(icon.getElement().getString());
}
String content;
if ("".equals(caption)) {
// Ensure that empty options use the same height as other
// options and are not collapsed (#7506)
content = " ";
} else {
content = WidgetUtil.escapeHTML(caption);
}
sb.append("<span>" + content + "</span>");
return sb.toString();
}

As you can see, VFilterSelect create hard coded spans, and hard coded escaped htmls

Is there ways to 

• - create a custom VFilterSelect that is not creating spans ? but div ?
• - create a custom VFilterSelect that does not call WidgetUtil.escapeHTML() 
• - create some ugly js magic voodoo trick to  1/ "on-the-fly" get escaped html characters 2/ unescape 3/ let the CSS do the job ?

Or 

• Is there a method like setAllowedHtmlForCaption() but for items captions ?  

Thanks for your time, 
Regards, 
Fabrice,