Struct and macro - currency pair - ways to specify

General Usage
,
1

I’ve defined a currency pair as

struct ccy_pair;   
      c1::Symbol
      c2::Symbol
end

ccy_pair(x::String) = ccy_pair(Symbol(x[1:3]),Symbol(x[end-2:end]))

macro p_str(x)  ccy_pair(x) end

So I can write as ccy_pair( :AUD, :USD ) or p"AUD/USD".

Is it possible to write it any more briefly?
AUD/USD would be ideal but I don’t think this is possible.

2 
julia> using UnitfulAssets: AUD,USD

julia> AUD/USD
AUD USD^-1