I do have
an 1x1 embark (that I tweak a bit), but it is resource-rich, in a forested area and genned in 43.03. I assume that you request latest version due generation differences - if you want to just jump in, well...*uploads*
here's slightly tweaked save (more creatures, more towers, single-touch knockout dust clouds, partial air swamp reanimation) just post-embark (6 military and a preferenceless carpenter/leader/novice diagnostician).
Goals...many are possible, but here's 3 semi-unique to the situation:
Kill the first perhaps-summer undead wave by military might, and eventually kill Ener Chuckislands, 1325 year old wolverine man necromancer, founder of 80 towers.
Brew every booze in game.
Create world's first vampire. Weaponize.
But, it sounds to me like you want something more difficult, however. The first that comes to mind is from DF2014:
vjek's inhospitable embark (click on dffd link in that post and don't read before or further if you want to go in blind).
While you can transfer it to 43.05 you won't get full library package without modding as DF2016 introduced writing in stuff in your libraries, should you survive. vjek's suggested 5M goal is pretty nice for a check if you can establish a stable fortress on it.
For not using premades, something on your own, or just wholly 43.05, setting up a monster island should be fairly quick.
Alternatively? Try
scenario generator.