Yes it can be reflashed and you do not have to take it to a dealer or third party to do so.
There is a suite of software that allows you to get into your ECU to read the file, write/flash a bin file, read real time what is going on and modify the file.
In the same order, IAW Reader, IAW Writer, IAW Diag and Tunerpro.
First 3 here. IAW Diag is Win only.
Tunerpro here and is Win only.
Some infö here
I do not have a SBK, but have ridden the 1098 on loan for a week or so.
SBK message is probably the stock map and Race will be a DP map.
In Tunerpro it is possible to change the message.
As t_bare pointed out to me, this is a good way to keep track of what map/bin file is in the ECU if you are modifying maps/bin files
Not sure how many characters you can use, but I would program to U R Awesome
I know the 1098 I had on loan was extremely thirsty to the extent that I planned a long trip to MotoGP in PI I did not take the bike as with one road we take I would not have made it.
There are various opinions and experiences, however the forum consensus seems to be that stock map with aftermarket cans is OK.
You will not know until you can measure AFR which could be on a dyno or using ScanST or ScanMX with a wideband oxygen sensor.
Every bike is different.
You may be able to find a map/bin file where someone has remapped their bike.
Maybe post in this thread to ask the question - make sure you state year, model and modifications.