You could do it by changing the accidental style in your spacer voice.
\version "2.18.2"
Uppernotes = { \repeat "unfold" 8 { cis'8 } }
accidentals = {
s2
\accidentalStyle Staff.dodecaphonic
s8
\accidentalStyle Staff.default
s4.
} % doesn't work
LowerMusic = { r2 c'!8 r r4 }
UpperMusic = { \context Voice << { \Uppernotes } {\accidentals } >> }
\score {
\new PianoStaff
<<
\new Staff \UpperMusic
\new Staff \LowerMusic
>>
}
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