G8191

I have a workplace SAYE share plan maturing in 2025/2026 , over 5 years the investment is 12k and current value is 32k Am I able to transfer £17k worth of shares to a stocks and shares ISA and then sell 12k worth of shares (my investment) plus the £3k CGT so 15k without any tax implication leaving no outstanding CGT to pay ? Effectively I’m transferring the full £17k gain to the ISA and the remaining £12k plus the £3k allowance attracts no CgT. Nobody has so far been able to give me a definitive answer. Thank you in advance.