Checking in early and getting past immigration for a transit hotel?

My friend has a flight departing suvarnabhumi on Sunday morning and would prefer to stay in Miracle transit hotel on Saturday night.

She’s flying with smiles airlines and the website says online check in is open 24h before the flight. Just wondering if she can do online check in 14h before the flight, clear immigration etc to get to the hotel and then stay there till the next morning. She has no check in luggage so no bag drop required.

Just curious if anyone has done this before or knows if it can be done?

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