Is n53 engine "swapable"? If yes for which engine?

[ernnyxbmw]

Hi guys!

Like in the topic, is it possible to swap n53b25a with any less problematic engine? Im not an expert but im tired of spending so much money to keep this engine in good condition. I just replaced my HPFP for $1000 and now after 3000 km later I got nox and shaft position sensor indicators. My mechanic said it is caused by old injectors and i should replace them. Now Im confused becasue i don't know what to do. Is is worth to replace them for next $2300 or just get rid of this engine. I feel like the whole "party" is not worth it. What do You think about this? Pls help

P.S Sorry for my eng but it's my second language