Subject: Re: OT mostly: forevers
(b) no index trackers are allowed

With all due respect, it seems like an index is the perfect solution to your problem (as Buffett himself chosen for his wife Astrid) so I don't understand why you are ignoring it especially since you said not to consider current valuation in choosing the appropriate investments.

I would recommend 50% BRK and 50% index with periodic rebalancing (once every 5 years) assuming there are no taxes to be paid in Monaco.