which layout? for modular boards, just get your own switches. since you want detachable cables, you can look for everglide gk series (proprietary firmware); kbdfans' kbd67 (qmk-based); massdrop (now called drop) ALT, CTRL, or SHIFT (qmk-based). for these options, rgb is built-in, you can just turn it off.

the above is what i can think of. i suggest you do some own leg work to find out more.

as for custom made cables, i guess some sifus in mymkb fb page can do that but not sure.
alternatively, you can get better replacement key cap sets from taobao/aliexpress and continue to use it.

for soldered builds, i suggest you check out mechmarket fb page, https://www.facebook.com/groups/MYMECHMARKET/ there is a custom build by quovadis123 (retooled black, lubed with krytox gpl 105; supports bluetooth and wired) you can ask to see if stock springs be swapped with springs from red.
it's better you ask this at mymkb fb page, https://www.facebook.com/groups/MalaysiaMechanicalKeyboard/

uh? no you don't need to do that. the board is already built by quovadis123. the main reason i suggested this one is retooled cherry mx black batch 1 switches (which is smoother than typical cherry mx switches found in most oem boards), and they're already lubed with krytox gpl 105. i have a build of kbd75 with the same lubed switches, built by quovadis123 also. by the way, the retooled black he uses is the pcb-mount type, meaning they have additional 2 side pins that provide another layer of structural support for the build. (as a side note, if you built a plated custom, and the pcb supports pcb-mount switches, always use pcb-mount switches as is. don't cut side pins off)

the only concern to me is the spring weight. the bottom-out weight is 80g so it might be heavy for you. (i have swapped mine with 62g; so it feels like cherry mx red when typing)

i don't suggest you go for cm masterkeys pro s. i have one, and it sucks.

"If it's not broken, don't fix it"

Can always just get a set of keycaps to replace your current set. Can cost from RM30+ onwards. If you don't really care much of the backlight, I would recommend going for PBT keycaps for more lasting stems, but, as with the case of most PBT keycaps, they are not "shine-thru", some are, but very rarely made.

Of course, no one really stopping you from actually getting a brand new keyboard. If you do really decide to get a new keyboard and wants to get rid of the old Tecware with the broken keycaps, do drop me a message.
If you're looking for TKL sizing, I might have something that suits you, but I'm a bit unsure if your #3 "No RGB" does it mean you still need single colour LED? Or completely no LED is fine? #5 I don't really offer custom made cords, but I can do #4 mod into any pre-builts using a cable by changing the cable into a Micro/Mini USB port.

New Anne Pro 2 user here guys. Anyone know of shop in klang valley that has custom keycaps for sale or on display? wanna try real feel before i order some online.

thanks for the heads-up, bro. I wanna stick with pbt cos i really like the feel of the AP2 keys, just wanna mix up the colour a lil bit. So was hesitant about ordering online, but will take the plunge with some different price range sets and see what we end up with. Planning to upgrade the battery but still looking for the correct size  cable connector for the mod (JST 2-pin 1.5mm pitch).