Greetings from Sydney Australia, I can see there are very mixed feelings about the manager appointment, I can totally understand that.
There aren't any guarantees that Ange will be a success, I'd say chances about 50/50 but I will say from my observations of him in Oz that he is a much better club manager than at National team level which was quite frustrating at times.
I think he has gone back to a back four with Yokohama, not the back three he switched the national team to, so if he stays with that, that's a start.
The recruiting side of things I am fairly sure he will get involved with and will have good contacts in Europe. He managed to recruit from Europe very well when he took over Brisbane, only 5 foreign players are allowed in each squad here.
At a guess I'd say a player like Aussie goalie Matthew Ryan who's unsettled at Brighton could be a possibility, also I'd suggest if the central midfield needs more depth signing someone like Jackson Irvine who I've seen interviewed talking very positively about Ange, so there would be no problem with buy in there.
Also another player who could be considered is Daizen Maeda who plays for Yokohama and is just starting to get caps for Japan. I haven't seen him play live but his highlights are very impressive and has 9 goals from 20 appearances so far this season.
Anyhow what I'm trying to say is, it may not be as bad as you think. Good luck for the season ahead, I'll be following it with interest from afar.