Domain (elements) Variant

I'd like to be able to make a Variant of a Domain with Elements.
Instead of making 'close to double' Domains I'd like to be able to do the next:

Domain:

• "document_types"

Elements(just some examples):

• 1- Purchase Order
• 2- Sales Order
• 3- Invoice
• 4- Picture
• 5- Kick off Document
• 6- Financial Summary

So the case would be:
I have a Documents table with a column "document_types" with this domain.
As example there will be 2 views, where you can add Documents on different ways.
So view 1: I want to be able to add Purchase Orders, Sales orders and Financial Summaries
and in view 2: I want to be able to add Invoices, Pictures, Kick off Document and Financial Summaries.

To achieve this i would have to make 2 more domains for view 1 and 2 where I'll also have to make sure the database values are the same as in domain "document_types".
Right now it takes:
-1 Extra time
-2 The maintainability of these columns/domains are harder, because you need to make sure they are in-line with each other.

What do you guys think?