KLIA2 I-D PP Lounge options?
 

I plan to arrive from TPE on D7 at 4:30am transferring to an AK flight to PEN
Looks like KLIA2.
Which priority pass lounges can I visit?
Many seem to be international. Some are Landside.
I'm not exactly sure about how the transfer process works (ie. if I will need to goto landside anyways)

I'm going to try to get a shower at the plaza premium lounge at TPE before my flight, if I can't, it would be nice to try to get one at KLIA.
Otherwise, maybe some breakfast.
Though maybe I'll just be super tired and just want somewhere to take a nap.

I usually fly out of Terminal 1, but I’ve also used Terminal 2. I’ve been to all of the lounges in Terminal 2. That said, I’ve never used the showers in Terminal 2.

Exiting immigration/customs and making your way to departures is a little confusing, at least for me. I’m assuming you should be able to use the Sky Suites Lounge, which is very close to domestic departures. IMHO, it’s the best of the Terminal 1 lounges. Plaza Premium, which states they do have showers, tends to be overly crowded. But at the time you arrive, it might be ok. It’s a little hard to find.

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.

Personally, I’d transfer in Singapore.

All else equal, me too.