Two Travel Club lounges are both international departures
The rest of the lounges are all landside
Sky Suite - Near check-in counters Row S
Plaza Premium Lounge - next to 'Hometown Hainan Coffee' on the Arrival Hall to Level 2M.
Capsule Transit Max - Level 2M

It is not clear to me if the I-D transfer has me exit all the way out to the checkin counter area or if I get dumped back into the terminal. If the later, maybe I can visit the Travel club lounges before security (if permitted).
Ofcourse, I can always walk all the way out, but I don't know if this adds alot of extra time.

I basically have the choice between the TPE-KUL-PEN route (where I can choose a 2hr or 3.5hr layover. (I might choose the longer layover to allow me to take a nap in the lounge).
Or there is an option of TPE-SIN-PEN where there is the SATS or Plaza Premium Lounge. it's a 5hr layover and I think I can only enter the lounge 3hrs prior so not ideal. Though it isnt clear with PP if using my Capital One Venture X let's me in earlier.
I'm basically choosing the redeye flight + lounge instead of a hotel that night so I don't mind a longer layover if I can get some sleep.