Oracle to Oracle Initial load possible ?

Hello There,

We have 25TB of 12c Oracle Database on (sun solaris ) and our client wanted to move it to AWS ( Linux OS ). 

Can you please let me know how can we achieve this with minimal downtime with out setting up Datagaurd. 

Does Shareplex supports intial load like Oracle Goldengate do ? 

Is it possible to start Capture process only for 2 days ahead ? ( Thinking about to restore target DB with RMAN backup and keep export and post processes down until RMAN restoration is done )

Is it possible to start Capture process from particular Oracle SCN number ?  

Thanks