javax.xml.transform.TransformerException: Extension function: '{http://www.w3.org/2005/xpath-functions}format-dateTime' can not be invoked when the XMLConstants.FEATURE_SECURE_PROCESSING feature is set to true.

I defined an XSLT transform in my route using:

.to("xslt:mytransform.xsl")

The stylesheet is XSL 2.0 and is invoking a few 2.0 functions including
current-dateTime.

But I'm getting:
javax.xml.transform.TransformerException: Extension function:
'{http://www.w3.org/2005/xpath-functions}format-dateTime' can not be
invoked when the XMLConstants.FEATURE_SECURE_PROCESSING feature is set to
true.

I can see that the Xalan transformer is being used.
I understand that with Xalan not supporting XSL 2.0 I would not be able to
execute the transform anyway. My questions are:
1. Is there a way to get Camel to use a different processor that does
support XSL 2.0?
2. If there is, would the "FEATURE_SECURE_PROCESSING feature is set to
true." restriction still apply?
3. What's the recommended way to handle stylesheets like these, that invoke
Xpath functions? Would xalan extensions work?

Thanks