I would not recommend a pinkie pump if you are unable to assist your snake (snake will not swallow the prey) then you will need to force feed your snake, while force feeding is stressful it will still be a better option than a pinkie pump.

If that makes you feel better I had a very small hatchling that refused to eat on her own last season, would not make any effort to swallow the prey when assisted I had to force feed the first meal and assist afterward, now she is one of the most aggressive feeder I have ever seen.

If you have no experience force feeding I would recommend to find someone knowledgeable near you that can help you.