First thing you DO NOT assist or force feed animals that are that size, either method are for animals that have NEVER ate, obviously those got to that size because they ate.
Second what you want to do really has no bearing on what should be done, in the event those animals were live feeders than they need to be fed live. Now if they were eating f/t they will again when ready.
Generally speaking animal that size tend to be more prone to stress when moving to new surrounding, even more so with female, leading to fast which can be short or extended.
Given the size those animals could go 6 months without food with no ill effect so 3 weeks is NOTHING
Now what you need to do is look in your husbandry (temps, enclosure size, etc), if they don't feel secure downsize the enclosure, DO NOT handle them unless it's cleaning day, try to mimic their prior environment to a T (enclosure size, temps, substrate), offer the same prey type if it was live FEED LIVE and do so in their enclosure, and most importantly BE PATIENT they know how to eat do not stress them unnecessarily by doing things such as force feeding which should never be done in the first place with animals like those.
DO NOT offer alternate prey either Hamsters are like crack to BP and again alternative prey is never the solution but only contribute to make them even more difficult.
PATIENCE and proper husbandry is KEY.
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