Three thoughts come to mind:
1. If there are no actual photos of this specific plane, it seems you have at least enough info to create an "historically plausible" set of markings.
2. If there are no actual photos of this specific plane, no one can tell you that what you've done is incorrect.
3. I just hit my 60th year of model building and I can tell you, with assurance, that it has been proven, time and again, that 90% of markings were applied as per orders, but, inevitably, for whatever of a million reasons, some planes (and tanks, trains, ships, uniforms, etc etc etc) ended up being marked (or colored, camouflaged, rigged, armed, etc etc etc) differently than the others. 95% of us who build models know this and accept it and get on, happily, with our model building. It's the other 5%, the Experten and Rivet Counters, that should just be ignored. (Or shot.)
Case in point: My dad's second tour in the Pacific was in PV-1 Venturas. If you have a copy of PV Ventura in Action, look at the back cover profile. His PV is pictured there and you will see that the wheel hubs are painted blue and white. When the first 1/72 Ventura kit came out decades ago, I decided to build my dad's plane and, when I got to painting the hubs, asked him what the FS # of the blue was. In his classic, old up-from-the-ranks-sailor-made-Captain language, he responded, "oh bullshit....we used whatever damn paint we could get our hands on....there was a war on, God dammit".
Jeroen, I applaud you, again, for this excellent build and the sentiment behind it. You rock.
Cheers from NYC,
PS 60 years??????? Whaaaaat? I know....scary, right. Started at age 5 with an Aurora F9F like the one my dad flew and with a kit he brought home from the Pentagon newsstand. Pretty cool.