Air carrier Captain reported while on a go-around; ATC issued an immediate turn off the missed approach procedure and towards rapidly rising terrain. Pilot stated concern with language barrier and procedure could result in confusion and a terrain event.

Narrative

We had to do a go-around at MMMX Runway 5R from about 500 AGL. The preceding airplane missed a turn-off. The go-around and missed were flown manually and without event. Once the airplane was turned away from terrain we reset automation; ran checklists; etc.I bring this up because the Tower issued us an immediate 30-degree right turn. This aims the airplane toward rapidly rising terrain and takes it off the missed approach course. Radios are saturated at MMMX and there are language considerations. This worked out fine. There's potential for a crew to be confused; aimed at terrain; and low. Maybe include this in videos or other products? Since we're opening an Aircraft X base; it's conceivable that Aircraft X crews will see MMMX with more regularity. Of course; there's an argument to do nothing too. Are any of these factors different from any other missed approach briefing anywhere else? My job isn't to make those decisions; but to bring these factors up to the attention of appropriate parties.