So what you want is to swap Lyon with an EPL team so Lyon can play in the EPL in Master League? If so, then I can think of only one way, and it's not easy.
Pretty much, go into Edit mode > Teams > Register Player and take all players from Lyon into an EPL team and then take all players from that EPL team to Lyon. Then you will have to edit the name, logo, etc of the team you moved Lyon into aswell so it is actually shown as Lyon. That's the only way to go about it.
You say that there are no teams in the EPL with relatively young players that sit around mid table like Lyon (although that is not the case, seeing as Lyon is arguably the Chelsea of France). Have you had a look at Everton? Guys like Pienaar, Fellaini, Wallace, Rodwell, Heitinga and Baxter all reach around 90 or very close to it, and they generally sit mid-table in the EPL.