No, it is not acceptable and it is never done. It used to be done before the changes that appeared gradually in the 15th century, inspired by a paper most likely written by Jan Hus around 1400.
Before that the orthography did indeed use these digraphs, although somewhat differently.
cz meant c, not č
chz meant č
zz meant s
ss meant š
in the older form. ...
ś is the conventional transliteration for Hebrew שׂ ( śīn ), and is used also for its Semitic source, now more usually transcribed as s₂. It is believed that Old Akkadian (at least) still retained the Semitic distinction of s₁, s₂ and s₃ and used different signs for syllables containing each of these. This is reflected by the transcription of those signs.