It can happen!
I'm a hip hop head who has boys from London/UK and I've been into international hip hop since the early 90's (I've ran a couple of record stores in my time as well so I'm a music/culture student). As a kid who grew up during the Golden Ages Of Hip Hop (1986-1989) & (1992-1996) the whole UK speed garage/two step scene/musical aesthetic I was not feeling AT ALL. The Drum n' Bass sound made a little headway in the late 90's (Massive Attack, Tricky, Goldie, etc.) into the US but then it died. Starting around 2001 Grime/Eski started coming out and it sounded a lot more hip hop/reggae/calypso/socaish and it started taking off over in London and the into the UK and later it spread into Europe.
I've tested some joints out here in Boston by just throwing it on in cats whips or playing it in different settings and heads were open to it and asking what/who it was and nodding their heads to it like crazy. It all depends on WHAT tracks you play, though...rap fans aren't trying to hear anything too weird or experimental. You gotta start them out with Wiley, Kano, Dizzie Razkal, Roll Deep, Lethal Bizzle & Fire Camp, Jammer, Earz, Bruza, Crazy Titch, Kray Twinz, Mitchell Bros and Durrty Goodz. Mix in some Klashnekoff, Genesis Elijah, Kyza and Skoreseezy to keep the hip hop heads interested. Watch what happens...heads will start LOOKING for more of these joints ON THEIR OWN..(whether through filesharing apps or mixtapes or by buying import CD's). Think about it. If heads in the EAST started listening to Crunk music, Miami Booty Bass, and Chopped & Screwed joints then THIS isn't that much of a stretch in my opinion (plus it's much better lyrically and 75% of the time, musically as well).
As for the hip hop audience not being to get past accents, think about this, REGGAETON IS POPULAR AS HELL WITH ENGLISH SPEAKERS! Reggae and and other Carribean music forms get played on urban radio rotations with hip hop and R & B now...if Funkmaster Flex or any other respected DJ threw a Kano, Klashnekoff, Lethal B, Fire Camp or Roll Deep song in a mix show the people would most def feel it. The same reason Dipset and other crews are moving units in America is the same reason Grime is spreading in the UK. As for being teritorial, insular or provincial...those things happen EVERYWHERE. In New York, Boston, London, Paris, Perth and everywhere in between. One.