Thanks for the advices, I applied them all and plus some of my own...
First, I placed an Roaming Playmaker next to him so he can always be a passing option and contribute a few assists himself. I put the Inside Forwards on Support too, and finally I moved my playmaker down to a CM so he can be closer to his fellow midfielders and make a triangle of passing options. The instructions was also changed. I decided to make things simple by not setting too many instructions to allow my players to have some freedom, but I did lower down the tempo to give the AP and RPM some time to create passes.
I also set him to roam around so he can find space which seemed to work really well. He seemed to roam around where space was, and almost every time I saw the ball played to him, there was either no opposition players around him or just one.
I tested it out, and the results was very good. It was just one match, but it was against AS Monaco which was the strongest opponent I had in Ligue 1. It ended in 6-1, with a perfect hattrick by the Advanced Forward. The AP had himself a hattrick of assists, two for the AF and one for the left IF. The RPM himself also had a good day, with an assist to his name. The AP made 11 key passes while the RPM made 9 key passes. The AP would've gotten Player of the Match (9.7 rating) if it wasn't for the AF. (9.9 rating)
I'll come back later after a few more matches, but just from this one match this tactic is clearly working extremely well and harnesses the full potential of both of my best players.