Of course Jepp is the main resource for all Nav Charts, but for years they have supported biz jet trips like the other agencies by arranging overseas handling, permits, overflights, billing, etc. Not cheap but usually the reliable way to go.
Of course the prudent guy will add his adult supervision along the way so not to get tripped up.
By the way, ordered a Jepp trip kit 48 hours ago for N. Atlantic and Western Europe.. I haven't had a problem with getting the kits in a timely manner but nearly always have a problem with accuracy of my order...I have learned to get them 1 week earlier than needed so there's still time to get the missing bits sent out..