The R75 keyboard is a pretty decent one, sound dampening and its price point seems okay too, leaving great budget for high quality switches and keycaps. The fact that its QMK/VIA compatible is a big plus, also great board to start modding. Generally I don't like Royal Kludge's quality but this product seems to be a solid choice.
Apart from that one, I can recommend you Leobog Hi75, which has a nice, durable aluminum case; Ajazz AK820 Max Plus (sound dampening is good); Aula F75 (pretty nice sound dampening and long battery duration, sadly plastic casing); Wobkey Rainy 75 Lite (Amazing value for its price, great sound isolation).
If you ask me, R75, Hi75 and Rainy 75 Lite are all solid choices but Rainy 75 Lite and Hi75 are kind of a bit more premium products with their material quality and R75 is a better bang for buck, giving more window and budget for customization and showing the basics of modding a bit better.
Apart from that, I can easily recommend you the following brands: Akko, Ajazz, Wobkey, NuPhy, Epomaker, Gamakay, Aula, Mchose and GravaStar. Steer clear from Keychron (not as reliable as they used to be anymore).
I think most if not all keyboards come with stabilisers anyways. Kailh Prestige Silent Switches still have a bit of noise and I'm not sure if lubrication can help it, but lubrication will definitely do wonders on Outemu Silent Peach V3 or Akko Fairy switches over the factory-made lubrication. Also O-rings aren't needed much with silent switches but can help you with travel distances of your switches if you don't like the key to go down too much after the key push command is executed.
Oof it has been a long writing, lol. Hopefully I could answer all your questions and my answers give you some ideas about your future plans with modding your keyboard. Feel free to ask any other question you have in mind.
MKs are a very deep rabbit hole and your confusion is genuine, as even after having 25 MKs, 35+ switches and a lot of different Keycaps, even I haven't experienced a lot of stuff.
If you're ok with 75% check [r75](https://meckeys.com/shop/keyboard/75-keyboard/royal-kludge-rk-r75/?gad_source=1&gad_campaignid=23015596244&gbraid=0AAAAAC4dMgNEhRc5DGzVsXw8C2u_oXFhz&gclid=Cj0KCQjwy_fOBhC6ARIsAHKFB78HOesZubpcB9SzKUbeqQDvXyQ_G2XBFW5c5NnumDTa1UF3KaRoBQUaAg0UEALw_wcB) with brown switches. There are a lot of other options which could be better but most comes with linear switches only.
This should be decent, but this doesn't have shine through Keycaps. I forget that you mentioned good rgb when I suggested r75, as it also has opaque keycaps.
But I think you should go with hive 98 v2 as it can fulfill most of your needs. Only dive deeper if you really like the mk experience and left with an itch to explore more. Hive 98 is hotswappable so you can change switches very easily and Keycaps too if you want.
I can't speak to the sound quality, but pretty much all wireless keyboards also work wired so you shouldn't rule it out.
Looking at Amazon AU I see the [Keychron V1](https://www.amazon.com.au/Keychron-Mechanical-Programmable-Hot-swappable-Compatible/dp/B0DPPJBQ67), [Royal Kludge RK R75](https://www.amazon.com.au/RK-ROYAL-KLUDGE-R75-Mechanical/dp/B0CWGR5KM9), [Womier Q75](https://www.amazon.com.au/Womier-Keyboard-Topographic-Mechanical-Swappable/dp/B0DQV22S2T), and [Akko 5075S VIA](https://www.amazon.com.au/Akko-5075S-Mechanical-Programmable-Accessories/dp/B0CWX6Q4XH). All of these are boards I have tried or tried a different board in the same line, and can recommend. The Akko board is a barebones so you will have to add switches and keycaps... I would suggest the Akko Creamy Purple Pro for the switches if you go that way.
I would strongly recommend against that specific Royal Kludge model. The QMK/VIA versions of the RK61/R75/R65/R87 are OK.
Magnetic is not going to give you better battery life. Even TMR requires more power than simple switches.
Nuphy Air75 v2 perhaps.
CamelSoda420
