With nospell
if z= is issued
E756: Spell checking is not enabled

With nospell
if spellrepall is issued
E752: No previous spell replacement
Should this also be:
E756: Spell checking is not enabled

Should spellrepall only be available when spelling is enabled?

As a workaround, this works:

function! SpellReplaceAll()
  if &spell
    try | spellr
    catch
    endtry
  endif
endfun
nmap <F6> :call SpellReplaceAll()<cr>

How to make it work as an expression?

The following does not work :(
nmap <F6> &spell==1 ? spellr<cr>

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