[quote=@kingkonrad]I've thought that there might even just be German intelligence operatives on board who are actually just in for the cash, trying to get out of Germany with money before it all burns- might be a theme I'll also play along now you mention the Abwehr. 
[/quote]

That was basically my plan, especially given the institutional skepticism from as far back as 1937 of any sort of German victory in even a limited war against Czechoslovakia, and the wider skepticism that was present as early at the eve of Barbarossa - with OKH building its orders on incomplete and rushed Abwehr reports, which the Abwehr knew was incomplete when they were forced to make their final submissions a week or two prior to the start date. They've seen the writing on the wall for ages now, and with an impending dissolution of the Abwehr and its absorption into the SD-Ausland later in the winter of 43/44...well, let's just say that there's plenty of motivation to jump ship for certain folks.

Similarly, given the Abwehr's regular communications with SOE and OSS via the German vice-consul to Switzerland, it's certainly not unreasonable that someone might join in on an Allied heist to cover his own ass.