Restricting Standard LOV in HCM Redwood: Add Absence page using VB extension

Summary:

Main/Seeded Absence page: Me > Time and Absence > Add Absence

We have a requirement to restrict the LoV on Add Absence page. There is a value 'Mobile Working' in this LoV, which should not be displayed. And there should be another page (a new tile on Home page) through which, only 'Mobile Working' option should be displayed.

Since, this is a Redwood page, we tried through VB Extension, such as setting a condition and applying business rule OR calling an action chain through VBenter listener. None of the options is working.
Also, we would need a context set based on which this LoV shall be restricted such as if entering absence through standard page, we should have an identifier, based on which only certain values will be displayed in LoV.