Based on my experience with the MuseumKaart people, every email you send them with questions about shipping a permanent card overseas, questions with limits on usage, basically any question you ask them in English, you will get the following response:

"De Museumkaart is aimed at the Dutch public" - that is a quote copied and pasted from their emails, BTW.

which is the first step on them refusing to help you in any way at all. They claim overseas visitors shouldn't know about the card because "we do not advertise on tourist websites" - also a direct quote from their emails - yet that is exactly how I found about the card.

Good luck trying to deal with those people. 6 trips to The Netherlands over the years, and the Museum Kaart staff are the only people I've ever encountered who were outright hostile to visitors to the country.