I've gotta go knock out some work now so making this brief.
Make a save before traveling there. Prior to arriving open the console ~ and toggle AI off (~TAI) and then if that does not work try again with scripts off (~TSCR).
So that is three things to try - test for corrupt spawn point, see if there is an error in AI then in Scripts.
If already running UOP supplemental then perhaps not M'aiq. Maybe a kvatch mod you are running?
I don't have any Kvatch mods installed yet, I'm being very thorough with this install and checking for issues inbetween pretty much every modinstall. This one I stumbled upon randomly however when I misclicked while checking if fasttravel would crash me. I'll try with the TAI and TSCR commands, thanks for those tips!
Edit: Sadly neither of those 2 worked either, and I tried going there at different days/hours :/ Also tried using coc miscarcandexterior which is the ruin at -29, -1, ie very close by, and then using both TAI and TSCR. Moving from that cell onto -29, -2 will immediately crash the game (2cells from -29, -4 as per Arthmoors post). Couldn't visually see anything from that location which would be wrong before the game crashed.
Edit2: It seems there might be a mesh-problem of some sort, trying again with the CS and getting this errormsg when opening a cell that is close to it:
Model Load Error: Not a .nif file in .Will use the default object Marker_Errors.NIF.
When I choose either Yes/No/Yes to all the CS will crash