Cue clefs

[Gerardo Ballabio]

Hello, please let me ask two questions on the example below:
1. how can I move the cue treble clef after the bar line?
2. how can I remove the closing bass clef? I tried \omit Staff.Clef
but it doesn't work -- I guess because, indeed, that isn't the *staff*
clef.

Thank you
Gerardo

%%%%%%%%%%
\version "2.24.1"

\new Staff {
  \clef "bass"
  R1
  <<
    \new CueVoice \relative {
      \cueClef "treble"
      c''8 d e f
      \cueClefUnset
    }
  \\
    R1
  >>
  c1
}
%%%%%%%%%%