Help understanding Batch REST Endpoint

I know that in-platform automations are the way to go, but sometimes we need to think outside the box for some things we do.  I happened upon the Batch Batching REST Endpoint  and thought this might be one of the better ways to handle repeating work, but I've got a question or two.  Forgive me for getting a little verbose.

As I was reading through the examples for Batching REST calls and I noticed one (possible) omission.  The RestMethod doesn't seem to be able to be altered - in fact, it isn't even mentioned in the documentation.  I'm assuming that means batching has to be done with the same RestMethod. Is that correct?

Scenario: Let's say I have a user that's been created and is a member of the default (Registered Members) role, but I want to do a handful of things to that account:

1. Retrieve the user details
2. Add the member to an additional platform role.
3. Invite them to a Private (Unlisted) group.
4. Award them points.

Without batching, I'd run this as 4 different calls (in sequence):

1.  Get User REST Endpoint  [HttpMethod: GET / RestMethod: GET]
2.  Create Role REST Endpoint  [HttpMethod: POST / RestMethod: GET]
3.  Create User Invitation REST Endpoint  [HttpMethod: POST / RestMethod: GET]
4.  Create Point Transaction REST Endpoint  [HttpMethod: POST / RestMethod: PUT]

Those steps would lead to something like this:

1. Retrieve and store the user information: /api.ashx/v2/user.json?username=PeanutB
2. Add member to the role: /api.ashx/v2/roles.json?RoleID=322&include=user&UserId=297551
3. Create the user to group invitation: /api.ashx/v2/invitations.json?GroupID=1122&GroupMembershipType=Member&Email=peanutb@domain.com&Message=We#39;d+love+for+you+to+join+our+private+group.
4. Create the points award: /api.ashx/v2/pointtransactions.json
   Body: 

   {
       "ContentID": "ContentGuid",
       "ContentTypeId": "ContentTypeGuid",
       "Description": "You've been awarded a thing",
       "UserId": 297551,
       "Value": 1500
   }

Since there are changes between the RestMethod type, I'm confused if batching would even be possible.