Can I push stateless form entries into subform (inline) in another mainform?

Can I push stateless form entries into subform (inline) in another mainform?

My client wants to log all calls that come in from their registered customers. This will very quickly chew up their record limit. I am trying to figure out the best way to do this which balances simple UI with minimal record usage. 

One idea is to make the 'Log Call' form stateless and then push the data to a new row in an inline subform in the main customer record. My client only want to see the interactions per client and won't need any reporting etc so the limitations of an inline subform should be fine. Is this the best way? Any other ideas? If it is the best way could someone help me with the code? 

Thanks!

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