(Opinions needed) Likely upcoming changes to math mode precedence

General
24

You can already partially do this by sacrificing one of the symbol accents that works as a function already:

#let sin = sym.circle
#show sin: math.sin
#let accent-char = sin([]).accent
#show math.accent.where(accent: accent-char): it => {
  math.sin + $(it.base)$
}

These now render the same,
but the first line is an actual function call.
$ sin(x) \
  sin (x)
$
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