It’s trivial to design an inheritance tax that doesn’t tax a family’s (first) home and starts above a certain amount (500k, a million, two, make it 10 for all I care) that still allows lower and middle classes to build reasonable wealth. It’s also not that hard to not have a million loopholes for the excessively rich. That only gets difficult when people fall for the usual lies, like “businesses will close down and you will lose your jobs”.

Start penalizing tax havens like Ireland.

Tax based on passport, allow for taxes at their place of residence to take priority (so, you can pay low taxes in Ireland, but if it’s less than our tax, you pay the rest here), tax them a lot if they relinquish their passport. No need to start international beef about this.