Hi elotrolado,
This is certainly a very good option to have IMO. There are quite a few of the manufacturing members of the site which make mattresses that offer various options to choose your own layering and switch out layers either to change the feel and performance or to replace a layer that may soften faster than the deeper layers in the mattress. They are listed in post #21 here.
Unfortunately your $1000 budget for a queen is generally too low for a layered latex mattress and even a little on the low side for a high quality 6" latex mattress but you are well within the range for a latex hybrid which has a few inches of latex over a polyfoam support core.
A few examples of these include …
There may also be similar mattresses available to you locally.
Phoenix.