The most common word to indicate the conclusion of a se-phrase is tiam, and it doesn't have a temporal meaning when used in this function. So you can use it without qualms.

Some authors also use do instead of tiam in this function, but it is much less common, and not supported by Zamenhof's usage. Here are two examples from the Tekstaro de Esperanto:

Se A estas B, do ankaŭ B estas A.

se du sistemoj A kaj B termike ekvilibras kun la tria sistemo C, do ili nepre termike ekvilibras inter si.

The usage of tial in this function seems to me to be non-existent, or at least even much less common than do. So if you feel the urge to avoid the common tiam, and just dropping it is problematic, go for do. But really there is no reason to avoid this common usage of tiam.