Odd question but is it possible to get airside at TPE with a boarding pass for the following day?

I'm coming into TPE at 10:55am (from Okinawa) and then depart the following morning on a separate booking at 7:35am to Bangkok.

Ideally, I'd like to head into town for a bit then travel back out and stay near the airport. I've found the Novotel which appears close (any other close airport hotels?) but it also seems the Plaza Premium lounge has rooms airside (similar to Changi?) which means the wake-up time doesn't need to be as early.

- I'll have no checked baggage
- I should be able to mobile check-in
- I'm registered for Taiwan's egates (does this make a difference)
- The onward flight is in Business Class on EVA Air

My question is it possible to go airside (or even obtain the TPE-BKK boarding pass) the night before departure? If not is the Novotel best or is there something similar nearby?

Thanks in advanced.