Solving espressivo problem

[morten]

Dear list

 I am trying to solve this  problem about espressivos that stretches 
over four beats. I have tried many versions but not seems to solve it
The c1 and the b4 c2 b4 bars work as I hoped for.
the b2 c2 bar and the a2~ a2 does not give the wished for results.
Can anybody help?

*********
\version "2.24.3"

stuff = \relative {
    \time 4/4
      r4 b'4 a2~\< <>\! a2\> <>\! b4 4( c1\espressivo) b2\< <>\!\> c2\! 
c1\espressivo b4\< c2\!\> b4\!
     \bar "|"
}

\score {
    <<
        \new Staff
        \stuff

    >>
    \layout {
        \context {
            \Staff

        }

    }
}
*************


thanks
Morten