Can a 4.5 enter The Wimbledon if they paid the tourney fee? Is it even listed on TennisLink anywhere?
No, but a 4.5 can enter the US Open regional qualifying tournaments. If all their opponents get injured and default they have a chance.
This kind of reminds me an extremely wealthy guy I play tennis with and he joking said he was going to enter into one of those tournaments and try and pay off all his opponents. I don't think he ever tried.