It works; but frankly, it is not the use case that Swissquote (SQ, commonly) is meant for. SQ is mainly a (reputable) trading platform – and it is mostly used this way.
And especially, if the intention is like descibed below
such a person will︃ be remarkably more comfortable with any reputable Swiss private bank (and, probably, with a support︄ from some Family Wealth Office). Yes, there is usually ~500k-1m (sometimes more, for example for︅ Rothschild 5m) first deposit requirement but if it concerns large savings, it should not matter...︆ (furthermore, it is usually possible to open a discussion about it).
I am afraid, not︉ much. It is possible to open with Dukascopy but it has a sense only for︊ amounts less than 50k, otherwise it is unnecessarily expensive. Especially for business accounts, CIM Banque︋ can be used.