Well, yes but it would be awfully expensive unless Juho pays for the drive.
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They are probably the team with the biggest amount of money, their base is in Finland, Juho is their official test driver. I can see several reasons to let him drive apart from beating competitors.
Volkswagen plans to demonstrate 2017 World Rally Car in full livery
https://www.autosport.com/wrc/news/1...d-2017-wrc-car
At home, why not? Depends on several factors ofc, most importantly, how to sell that idea to the Japanese.
Rumours getting stronger and stronger about Nasser Al-Attiyah allready on Mexico in Yaris WRC.
He hadn`t been competing for a long time+ was ill with longlasting side effects. But yes, one can say these are the reasons not to compete. On the plus side, it would be his home event and he did it in 2017, quite well also.