help on adding Switch Case support?

[hyperchem]

I tried to unvirtualized the entry code of a protected binary. It seems the very first basic_block of entry code is classified into "switch case pattern", which is not supported in current version.
An example of "switch case pattern" is as following:
{(-0xe9d521f90e+qword[(0x4b62016+&&base)]#0x3dbddf3?)}
the meaning of this expression is read a qword from 0x4b62016+imagebase, add a imm -0xe9d521f90, and results in another imm, which is the finally branch destination.
In this very first basic_block, the number of destination is only one, which is not a real switch case.
I want to add support for this situation. Could give me some guidance for adding some code for this?

[can1357]

Use -opt:const, this is just ultra obfuscation.