Since you enjoy TCW, I'd say something like 21CW or CWA would be most accessible.
CWA has a fantastic roster including tons of exciting young talent. Their product is Classic Balanced but it could very easily be changed to a more "AEW"-type product like Wrestling Nerd Nirvana or Three Ring Circus. Honestly, CWA feels like a "better" TCW - but the challenge is getting them popular in other countries.
21CW is kind of similar the SWF in that its a pretty standard sports entertainment company. The positive side is that you've got Tommy Cornell alongside his cousin Edward and the third pillar of the main event scene, Adam Matravers - they're all great. And then there are a couple really fun talents that you could push hard like Buff Martinez, Sebastian Koller, Mark Adonis, and my personal favourite: Gravedigger. However, the downside is that the UK scene is pretty dead in terms of talents that could make it in a sports entertainment company like 21CW. There are a couple good talents in Europe though.
As some have mentioned, RAW is the other company that has feasible potential as a global company. They're a soap opera-type promotion that doesn't care much about the in-ring product. They've got some ridiculous star-quality guys and it is feasible that the promotion could become a cult sensation globally thanks to the charisma of guys like Swoop (he's basically an aussie version of The Rock).