validating the URI of $this, and ensuring superclass disjointness

two more shacl puzzles that I'm hoping to transpose from spin:

First involves the string value of what would be $this in a sh:ask clause;
the problem is to ensure that the base URI of the current focus instance is
different from the base URL of the schema:url property.  In SPARQL this
would be something possibly like ...

    sh:validator [
     sh:ask """
ASK {
OPTIONAL {
$this schema:url ?url .
BIND(CONCAT(str($this),'#') AS ?me ) .
BIND(CONCAT(str(?url),'#') AS ?it ) .
FILTER( STRBEFORE(?me,'#') != STRBEFORE(str(?it),'#') )
}
}""" ] ;

Can this be restated in pure SHACL?

Another issue is in ensuring that all superclasses of the current focus
instance are disjoint.  Again, in my (probably naive) validator rule:

    sh:validator [
        sh:ask """
ASK {
         $this a ?class1 .
         $this a ?class2 .
        FILTER (?class1 != ?class2) .
        ?class1 (rdfs:subClassOf)* ?parent1 .
        ?class2 (rdfs:subClassOf)* ?parent2 .
        ?parent1 owl:disjointWith ?parent2 .
}""" ] ;


-- 
Gary Lawrence Murphy <gary@schemaapp.com> - Hunch Manifest, 15 Wyndham N
'C', Guelph