attribute set / attribute group / attribute creation

I need the following:
A script that fetches data from a database and creates attribute groups and attributes.

Data structure 1)
Key, Name

Data structure 2)
Group, Name
Key, Name

The script should create the Key in a custom attribute set (constant name, set by variable).

e.g.
T123 mDataitem1 (DisplayOrder 2)
T124 mDataitem2 (DisplayOrder 1)

And
H123 eHeading2
T123 eDataitem21
H124 eHeading3
T125 eDataitem31 (DisplayOrder 1)
T126 eDataitem32 (DisplayOrder 2)

This should result in the following structure:
$attributeset
$defaultcat
Key T124 - Text mDataitem2
Key T123 - Text mDataitem1

And
$attributeset
H1234 - mHeading3
T125 mDataitem31
T126 mDataitem32

To be used: in command line
Field types: All fields should be Text fields by default that are comparable
The specific parameters at creation should be editable in the script.
Implementation: PHP is ok. Needs to be implemented via Mage, no API like SOAP or XMLRPC is permitted. Direct SQL is also possible, if it is guaranteed to clear the relevant caches.

Please line out your solution approach before acceptance of this.

The pay version you are working against is http://www.magentocommerce.com/magento-connect/NETZKOLLEKTIV/extension/4587/coreapi