I honestly think it’s a very bad idea. There’s a much bigger picture than just losing money.
You’ll need to make sure you can afford to and plan for quarantining 2 weeks before you go and 2 weeks on arrival to the UK (at least) at a moments notice. Things can change very quickly and you may get caught in the crossfire.
You need to be prepared that vaccine passports will be essential for the country you’re travelling to. This means you’ll need to be fully vaccinated obviously but also that you have enough time between applying for the passport and receiving it. We’ve never done anything like this before, there will be hiccups.
We have no way of telling whether unvaccinated children will be permitted to travel.
You need to be prepared for local restrictions. Many other counties aren’t doing as well as we are with vaccination programmes and will be in and out of lockdowns for the foreseeable. How disappointed are you going to be if you spend that money, travel all the way and can’t do anything.
You’re going to need watertight holiday insurance and pay for it. You’re knowingly travelling during a pandemic. How sympathetic do you expect travel insurance companies to be when one of you is taken unwell?
Those are just my first thoughts but unfortunately I agree with PPs, a big part of why winter was so terrible was that the world and his wife were taking holidays abroad in the summer. Only a year down the line, there’s not a chance I’d be sharing recycled air with 100 other people. Having said that, I do understand the desperate need. It’s tough.