[AmityvilleHams]

There is no way to reintroduce them. That would be setting yourself up for serious negative consequences including potential serious injuries or even death.

You really need to get some kind of emergency second cage even if it's on the small side. Temporarily living in a small cage is far better than setting yourself up for failure and risking your hamsters' health, safety, and overall wellbeing. I know it's hard to see this kind of response and it's not what you want to see, but this is the same kind of thing others will tell you.