Is it possible to convert some IRIs to blank nodes in SPARQL?

Question

Given the following Turtle:

prefix : <http://example.org/>
prefix blank: <http://example.org/blank>
prefix rdf:      <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

:alice    :friends  blank:b1 .
blank:b1  rdf:first "Alice" ;
          rdf:rest  blank:b2  .
blank:b2  rdf:first "Bob"   ;
          rdf:rest  blank:b3   .
blank:b3  rdf:first "Carol" ;
          rdf:rest  rdf:nil .

I would like to create a SPARQL query that translates all URIs like :b1, :b2, ... to blank nodes like: _:b1, _:b2, ...

So the expected result would be:

prefix : <http://example.org/>
prefix rdf:      <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

:alice :friends  _:b1 .
_:b1   rdf:first "Alice" ;
       rdf:rest  _:b2  .
_:b2   rdf:first "Bob"   ;
       rdf:rest  _:b3   .
_:b3   rdf:first "Carol" ;
       rdf:rest  rdf:nil .

which would be the equivalent to:

prefix : <http://example.org/>
prefix blank: <http://example.org/blank>
prefix rdf:      <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

:alice    :friends  ("Alice" "Bob" "Carol" ). 

An initial attempt that I tried is:

prefix ex: <https://example.com/ns#>
prefix rdf:      <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

CONSTRUCT {
  ?bnode1 rdf:first ?value ;
          rdf:rest  ?bnode2 .
  ?s ?p ?o .        
}
where {
  { ?iri1  rdf:first ?value ;
           rdf:rest  ?iri2 . }
  BIND(BNODE(str(?iri1)) as ?bnode1)
  BIND(BNODE(str(?iri2)) as ?bnode2)
}

But the semantics of BNODEaccording to SPARQL spec indicates that it generates a new blank node for each solution mapping, so the generated blank nodes are not linked. For example, using Jena, I obtained:

@prefix :      <http://example.org/> .
@prefix blank: <http://example.org/blank> .
@prefix ex:    <https://example.com/ns#> .
@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

[ rdf:first  "Carol" ;
  rdf:rest   [] 
] .

[ rdf:first  "Alice" ;
  rdf:rest   [] 
] .

[ rdf:first  "Bob" ;
  rdf:rest   [] 
] .

which is not what I want.