There's a document with all cases to solve last layer corners + U center while inserting the last corner, but it's 90 algs and it's almost always faster to do layer then one algOLL skip or VLS and OLL with EG on skewb would be helpful.
Instead of just EG, you can do EG and orient all top side at once. (EGOLL) This will get rid of L5C and first layer helpful.
If OLL skip is possible for skewb, it will get rid of advanced sarah cases and L5C. It will leave off L4C or L3C. (VLS)
downside is that i cant work on my ksolve program, my stupid command prompt is too advanced and frustrating
The EGOLL algs are decent, there's a document with nice algs but it's rarely worth it to use them if you want to be really fast