oracle 10g xe to 11g xe upgrade
I would try the following:


Install an oracle 10g database  software that I download from the oracle software download page (i have the appropriate license)
create an empty database with this software 
using the exp-tool (classical export, not datapump) to make an export from the database 
import the dumpfile (with the classical imp tool) in the empty 10g database I created
now i do the export from this database and import this in the 11g database 


step 3. is possible because the classical export does not create any table in the database in contrast to the datapump export. so i think i will not hit the 4g LIMIT ERROR

step 5 is possible because now the expdp is not constrained by any 4G limit.

it is not supported to import in step 4 into an 11g database but one can try if this is possible.