Maybe not (really) related to FIA R4, but this one relates to AP4, another alternative to R5, and this made me surprised.
There are some rumours in Indonesian rallying that one - estabilshed - rally teams are designing Mitsubishi Xpander AP4, which the base comes from the MPV car itself.
Previously they planned to build Mazda 2 AP4 after their visit to Australia/NZ, but it didn't happen because their ties with Mitsubishi

A huge majority of the times teams that have not supported the driver in the lead after the summer break, found that the decision lead to them losing the driver's championship. The 2017 season comes...
Should Piastri leave McLaren?