The big challenge will be opening hours. If you arrive on time you'll be able to access EK lounge, currently listed as open until 10:10am:
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The other OW lounge options open at
QF F & J - 3:15pm (4 hours before QF2 & QF72 on Sundays, 7:15pm departure)
BA J - 4pm
EK J - 5pm
QR J - 6pm (or reportedly slightly prior)
If you have Priority Pass or Plaza Premium there are a few options open all day but they're certainly not worth sticking around for IMO
Personally I would relish the opportunity to gorge on cheap Singaporean hawker food for a few hours
My itinerary would be something like
- EK lounge for a shower before passing through immigration, then ATM for some cash
- Grab to Mihrimah Restaurant for a Prata Ikhwan & Teh Tarik breakfast
- Bus straight down Victoria St to Hong Lim/Chinatown Complex/Maxwell (infinite hawker stall options..)
- Bus back towards Old Airport Rd hawker centre for more food, and a beer at Hello Ren Min if it's open
- Grab to Pink Blossoms Brewing on your way back to the airport. Middle of nowhere but objectively the best SG beers by a very long way.
- Grab back to the Airport, straight to QF F for another shower and a change!