I am sure this is a very elementary question but I am puzzled I cannot find others who have asked before me.  I want to be able to edit my "create" pages so that only the basic fields needed are shown. We often have fields that are filled in by integration or installed packages etc that my users would never fill in. 

I know in lightning I can create a global and custom action to create my own button but that only makes it available in the related list on a related record - for example "create contact". Did that - users love it.

Now they want the standard new button on all objects to open this custom create screen - but the only way I can find to do this is through override to VF page or lightning component - which I cannot code myself.

Is there really no way to add my global action to the tab buttons or at least override the standard new to the global action without code??