I'd put Hintz to the wing because he would arrive so late. Maybe Pesonen out, because someone has to make room. Pesonen didn't get a fair shot yet playing in the line up because he played just one game and that could be just adjusting to his line mates, but it is what it is.
Rantanen-Manninen-Hartikainen
Hintz-Suomela-Kapanen
Armia-Sallinen-Kakko
Lammikko-Björninen-Mörkö
Lammikko + Armia or Lammikko + Sallinen forms the second PK forward duo.
Sallinen has been a useful offensive piece so far, but someone has to make room for Hintz in the PP units, so Sallinen goes playing PK. Other option is to put Armia playing PK and keeping Sallinen in the PP unit. I actually think that realistically this is more likely to happen, because Jalonen doesn't want to change the first PP unit, which is working, so Sallinen might stay in the first PP unit, even over late arriving Hintz. Oksanen would be put out of the line up because I doubt that removing Mörkö from the line up is going to happen.
Suomela & Kapanen reunited, which I like as a duo. This line would have some skating speed for sure.
As for the next game against Sweden, I think Larmi should start, but this goalie battle is still very close.