Slurs inside a beam

[David F.]

While we’re on the topic of bending slurs to our will, I’d like for slurred, 
beamed eighth notes to have the slur printed below or inside the beam.  This 
works with a simple ^~ for ties.  How might I accomplish this? 

\version "2.19"
\language "english"

\new Staff \with { beamExceptions = #'() } << {
     e'8 ~ e'8  % Tie bends down
     e'8 ^~ e'8  % Tie bends up *below* or *inside* the beam

    e'8 ( a'8)  % Bends down
    e'8 ^( a'8 )  % Bends up *above* or *outside* the beam
    
    \tuplet 3/2 { b'8 ( a'8 ) f'8 }  % Bends down

    \tuplet 3/2 { b'8 ^( a'8 ) f'8 }  % Bends up *above* or *outside* the beam
}>>

The behavior I am after can also be seen here:
  https://hymnary.org/hymn/SS4C1956/page/561

Thanks!
David