I live in the UK and my partner lives in Sweden. We want to find a prepaid travel card solution that means we can both top-up the same card from our separate countries (and bank accounts) and then use the same card to spend when we are together.
If you just want to have one card, that one of you keeps, and you only use the one card for ‘together’ spending, something like Revolut might be useful. It can be topped by by a debit card from any country.