I have the TKL version with Cherry Red MX Silent and it's awesome. Use it wireless all the time, have changed the batteries once in the 4 months I've had it.
They do the same keyboard with MX Browns (or MX Blue).
I went for the Silent Red for noise reasons. I live in a flat that's all on one floor, there's not much sound insulation between anywhere in the flat and I do a lot of typing (and fast) so noisy keyboards make a lot of noise.
Filco?
Any with "Convertible" in the name means wireless (Bluetooth), e.g. https://www.keyboardco.com/keyboard/uk-filco-convertible-2-mx-silent-red-soft-linear-keyboard.asp
I have the TKL version with Cherry Red MX Silent and it's awesome. Use it wireless all the time, have changed the batteries once in the 4 months I've had it.