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There's nothing stopping you buying LP switches, designing a wireless PCB and firmware, and designing/milling your own case so yes, it's possible. All you need is lots of time and money and to be mentally competent.
That's a vague answer to a vague question - if you're looking for recommendations it would be helpful to know which feature(s) most interest you 
money to buy switches and time that I can bring into the table but being competent to script my own software that's something I cannot do

I am after an ISO layout (ES - ES), low profile, 75 up to tkl, wireless keyboard. I haven't pulled the trigger on g915 because I don't want clicky switches - ideally I would love linear silent switches but as far as I know there is nothing like that, so linear will be. I will be upgrading from a membrane keyboard (k120) and I don't want it to be noisy, unless I want to pick a fight with the missus

I wouldn't mind doing the soldering and that myself but I have really been struggling to find the bits for the keyboard. I heard about adafruit feather bluefruit 32u4 or something like that but I would need to write the code myself and that's just not going to happen due to my own knowledge limitations.
I was hoping there was a keyboard that would just bring into the table a fast wireless connection, since I like to play competitive videogames (such as csgo) and I don't want to be frustrated because I am dying because of the keyboard. I know I could just plug in the cable but what is the point in getting a wireless keyboard then?
@Findecanor
if I spend €200 on a keyboard I won't risk disassembling it because I wouldn't want my warranty void. thanks for the input though
