on prem connection/routing for on-prem and vmc on aws

we are looking at joining our existing infrastructure with vcdr and vmc on aws.  the question that has my org stumped is the routing for the vpn / connection and it goes like this: 

if we expose a subnet to the vpn and vmc on aws, lets say and have 6 vm's on that subnet, can 3 be powered on and function on prem and can 3 vm's be powered on and functioning on vmc on AWS at the same time?   

a second way of asking this question is  does the can you split a subnet,  lets say,  where half the subnet can live in AWS and the other half live on prem, as well as the gateway for the subnet, live on prem, without extending the on prem network into AWS?

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