I know Wilson doesn't have AML on his positions but he's definitely a good option to stick out on the left as a standard winger throwing bombs onto the top of Kieffer's head, Not sure how he'd play though. On the opposite side side You've got James to do the same with Johnson as a PF. I believe you also have the likes of Matondo and Brooks for backup till some crazy good regens come through.
Alternatively a 4-2-3-1 with 2 CM, IF or IW on both Sides, AP behind big Kieffer with more direct passing and more crossing.
Us Welsh don't have an embarrassment of riches, but they have guts and determination by the bucketload (Normally). I've never done an all Welsh squad from the get go, Only ever tried it after a good few seasons into the game as the youth that is coming through right now (in game) isn't the greatest.
I feel inspired now to do an all Welsh club!