i like the way you think, maybe a bonus path added to the gold gen to an exclusive hut for the egg
the gold production rate is very slow, players have to get a minimum of 9 gold to cover the egg (in op), if the game was normal mode it would need 30 gold just to get 3 obsidian, OP or not if you rush in the first 40 seconds of the game you would reach the egg without any obby on it
1) whenever building to an island make a staircase and u will reach the egg in 1 piece, not getting punched off unless someone manages to reach your bridge, 2) you know that little rock thing near the current egg location, lean on it and build upwards meaning whenever they punch you, u won't fall off unless they punch u in an angle
3) if you wish to use the wooden slab bridge, barricade it with some sandstone, it would buy u some time, and if possible knock players off the edge not kill them to gain bonus time
+ think of it the other way, if someone was trying to reach up to your egg and they were using the slab bridge just punch them off, then you would be happy to save your egg and thank the slab bridge (unless u didn't care about the egg or didn't have one)
just jump.. you know the entrance to the egg could be used as an exit as well, just exit and jump on them, by the time u reach they will all be at the island unless they were escaping while u were mining their egg's defences which cannot be avoided no matter where the egg is (unless u trap them)
If you were rushing i doubt they would have any bridge connected to another island until after atleast 1 minute, of course they could run to your island...