Need to network multiple identical subnets

Hi all, so I'm stuck in a situation where I have multiple identical subnets (sets of identical devices with same IPs etc) and I need to have this talk to my primary network. Basically each set has devices with IPs 192.168.0.10, 192.168.0.20, 192.168.0.30 etc on a /24 mask. Primary network is 192.168.20.0/24 for example...

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I'm thinking vrf based NAT but not 100% on what I need to do to make this happen. I'm CCNA but that was a long long time ago and I can't really think of the solution.

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Cheers!