How to create HexRays variables in IDAPython correctly?

Question

Let's assume we have a function which has a following variables in it:

• Local variables on stack of different types, including types defined in local types window
• Local variables of different types mapped to registers
• Function parameters of different types

I have 2 IDBs with the same function based on the same binary and I want to pass this data from one IDB to another. Let's also assume that I have a solution of passing related data types between databases.

I know that I can iterate the local variables in decompiled function by using user_lvar_visitor_t class. I also know that there is a function save_user_lvar_settings these variables by using of the same iterator class user_lvar_visitor_t.

I have the following questions regarding this:

• Which data should I gather from the first database to create these variables in second database correctly (with IDAPython, IDA version is 6.8)?
• How can I create these variables in the second database to make use of save_user_lvar_settings or restore_user_lvar settings (with IDAPython, IDA version is 6.8)?

Update: Before asking this question I reviewed the following IDA collaboration solutions:

1. Collabreate
2. ida2sql
3. IDA toolbag
4. IDAsynergy
5. IDAsync

One more update

6. Diaphora

And was not able to find solution for my problem in any them.