Hi Jeremy,
as per my knowledge BSEG is cluster table which carries lot of information and having around 360 fileds however every cluster table having some alternative tables which are having limited data.
I suggest instead of using bseg use alternative tables.
for GL use BSIS,BSAS
customer use bsid,bsad vendor bsik,bsak.
Those are sufficient which gives entry bseg information and having very limitted data.
Regards,
Raman