i know its not the answer you want but - making a starter isn't hard for me?
you could measure out 250g bags (what i do for a 2 litre starter) and set them aside, though i find measuring ~250g is pretty easy. i get 2 litres of purchased distilled water boiling, add the DME and a pellet of hops. boil for 10 mins, then let it cool down by itself.
idk, total time is 20 to max 25 minutes. thats pretty alright imho.
the alternative of preparing wort would require pressure canning, is still potentially dangerous and take time itself.
maybe freezing wort and melting it could be faster?