To override the element-name mapping for a given paragraph, insert a DocBookTag PI marker in the paragraph, with content the desired element name.
If mapping (or overriding mapping) does not suffice, and you do not need to specify a required ancestry for the element, use the following instead:
See §37.9.3 Surrounding or replacing text with code or macros.
Another alternative would be to bracket the text with Config PI markers, with content such as [StyleCodeBefore]=<element> and [StyleCodeAfter]=</element>; see §42.2.2 Overriding settings with configuration PI markers.
Note: Mappings provided via [StyleCode*] settings or markers do not participate in any ancestry you specify for the element in question; see §26.5 Nesting DocBook block elements.