No, sorry but no. That's not how the precog Shards work. The reason why neither Contessa or any other precog's power doesn't work on the Endbringers or Scion isn't because the Shards cant detect them, it's because the precog Shards(and every other Shard actually) are full of
malware. The precog Shards are
literally programmed to ignore the existences of the Endbringers and Scion outside of their actions(which is also how precog's get around said blindspots, by modeling the actions of those beings to further refine their predictions).
The seven would not have that protection, they would not be on the precogs "Ignore" list. As long as they are on the planet they are fully in range of all the various Shard's detection and scanning ranges. And while the foreign nature of their powers might end up confusing the precog shards at first and get them to throw up false predictions in the beginning, the longer they are on the planet the more time they are giving the Shards to watch, scan and analyze them and their abilities and eventually any "fuzziness" in the precog's predictions towards them will disappear.