delaydexpansion and endlocal conflict, any solution?

Question

I find it an embarrassment when I want to use endlocal inside an if/for statement.

Please check this delayexpe.bat :

@echo off
setlocal EnableDelayedExpansion

set dvar=oldata

if "1" == "1" (
    REM Deliberately need a delayed-expansion context
    set dvar=newdata
    echo [1]=%dvar%
    echo [2]=!dvar!

    REM I want to set outvar for my calling environment, so I need endlocal.
    endlocal & ( set "outvar=!dvar!" )
    
    REM Normally, here will be an `exit /b 0`.
)

echo [3]outvar=%outvar%

exit /b 0

The output is:

[1]=oldata
[2]=newdata
[3]outvar=!dvar!

It means that delayed-expansion syntax !dvar! does not take effect on the same statement as endlocal, BUT, I need that endlocal because I now want to change my parent environment.

Moving endlocal outside the whole if block so to use endlocal & ( set "outvar=%some_temp_var%" ) may be a solution, but complicates the code flow.

I just can't figure out the reason why CMD refuse to expand !dvar! along side with endlocal. Can anyone clarify this?