This presents a considerable risk of splitting English into several languages, none of them intelligible with the others.

have you ever been to Newcastle?

Aye man, wey aye, went doon there worra bairn, didn’t ah? Cannae remember much like, was only a wee nipper at the time, knaa what ah mean? Me mam an’ da took us doon the Toon when ah was nowt but a little’un, like. Divvent really remember owt aboot it proper, but aye, been the once when ah was just a littl’ bairn, me. Proper yonks ago that was, pet!

(Translation: yes, once as a kid).

The deity in question would also have to smite purveyors of LLM translation. This might of course not be considered a drawback...

Related and recommended: Greg Egan “Phoresis” a sci-fi novel of two twin planets in extreme proximity to each other. (I think I read it in one of his anthologies.)

To get to the Kármán line (100k) a mountain with a 60 degree slope would require a base of 115km. A cone with 115km diameter base has a volume of 3.5×10^5 km^3. Which is 3.5x10^14 m^3, which is about 10^15 kg of rock. So it is going to take you a while!

3.5x10⁵ km³ you say?

1.08321×10¹² km³ is the volume of Earth, feasibility study done! Implement!

The molten core probably isn't going to be much use.

Surface area is 5x10^8 km^2. So it it 'only' the first ~2m of the crust (~6m if you don't count ocean).