newbie here...new to chicks and never had to cull anything at home only cats and dogs at the vets...So please excuse me if this is a dumb statement
just wondering if you are looking for a gentle way of putting it to sleep , I asssume you will not be eating this chick... why not give it a big does of benadryl?? A big dose, would make it go to sleep and actually od it with it, and it would die in it's sleep. Wouldnt it??
IMO , the starter fluid will give respitory distress I would think it is uncomfortable to go that way.