UK - sell crypto before tax year and after new tax year

Hi

I'm based in United Kingdom, I want to sell a portion of my crypto that I have. As you know the last day of the tax year is 5th April. So can I gift my wife 3k, which she can sell off and withdraw for cash, and I do the same thing i.e sell for cash and withdraw to my bank account. All of this will be done before 5th April. After the new tax year I.e. 6th April, can I do the same again? I.e. gift my wife 3k of crypto and I do the same for myself? So in total I'll be getting 12k tax free allowance? So can I sell anytime after 5th April to get 6k tax free.

Many thanks for your help