Connecting the Southern Mirkwood via item teleports
In other words, in the exact same way the boats between Mirkwood/Lothlorien work -> accessible only after the Landing instance, except here the mechanism would need to be attached to a different item, such as a rope perhaps = our character is using a rope to climb a small slope and then they "travel" (teleport) North to Eryn Lasgalen, for example! That could be a great way to make Mirkwood more accessible from more directions, even if it's not a part of open-world (and even if it finally was a part of it, who even knows when we're going to the Narrows and Middle Mirkwood to fill this gap, might be a while... so teleport solutions welcome!)
The Scuttledells in Mirkwood: r2 lx966 ly1139 ox139.67 oy76.41 oz563.46 h83.0.
(the rope can have a tooltip text that this is an extremely dangerous journey, as a warning to lower lvl players who stumble upon it, just like the Beorning who warns the player before they teleport to the Vales from Misties)
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to Eryn Lasgalen, relatively safe at the edge of the map near the peaceful hilltop: r2 lx1000 ly1360 ox0.56 oy6.82 oz693.29 h232.0.
Dourstocks: r2 lx910 ly1134 ox123.11 oy124.74 oz591.20 h15.5.
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to the Vales of Aduin, next to Blomgard settlement, so relatively safe: r2 lx909 ly1224 ox108.81 oy3.34 oz459.47 h142.0.
Optionally, Brownlands Road: r2 lx990 ly942 ox132.25 oy126.15 oz411.31 h225.0.
(can use a swift horse instead of portal)
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to Southern Southern Mirkwood, near elven ruins: r2 lx983 ly1048 ox143.46 oy19.83 oz465.04 h113.9.
I know the excuse here is Brownlands is locked in time under Easterling attack but still... one might say the Easterlings have already passed through and encamped in hills adjacent to Rohan, so there shouldn't be any armies passing through this road any more and our character is more than skilled in dealing with occasional scout or two, or a smaller band of enemies. Who knows when we're going to the rest of Brownlands, if ever, so I would welcome a connection here