Yes, you can switch.
You can just fix with UB immediately (2 year 2.3%) or go through the switching process with KBC. There's 3k cashback, legal & valuation will cost you about 1400, and it'll take a few months.
Thanks RedOnion. And the breakage fees. I saw someone else on a different post just saying there that they were quoted in excess of €3,000 for breaking the fixed rate. It seems very excessive?