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I think you have searched well - there are plenty of options if you were looking at WRC Champions from the late 70s through to 2000. Since then, fewer models have been made. 

The early 2000s champions are possible. Several brands produced WRC models at the time and are still circulating on the used / new old stock market. Look for SCX (branded Scalextric in Spain), Scalextric (UK), Ninco, AutoArt and Carrera.

As the 2000 and 2010s went on, both Ninco and SCX hit financial issues and AutoArt disappeared. You will be able to find a C4 (Ninco), a DS3 (SCX), Fiesta (SCX) and Polo (Scalextric), but no pre-hybrid Yaris in 1:32 scale and no hybrid era i20. SCX and Avant Slot have the current Rally1 Yaris with plenty of livery options.

Unfortunately, looking back, the championship-winning liveries you are looking for were either never produced or are highly sought-after (ie super-expensive, if you can find them). Hub’s article will help. Decals are available, if a re-livery is acceptable.

Apart from eBay, some places to look for those out-of-production rally cars are Phil Smith slot cars and Scale Models - or get along to a slot car Swapmeet - Phil Smith has a calendar of UK and European events on his website. There are also some UK-based Slot Rally groups on Facebook.

Do keep us posted of your progress!