Does anyone know of a way to loop through a User-Defined type?

Here is what I am looking to do. Say I have this UDT...

Public Type BigType
a1 as String
a2 as String
a3 as String
....
a50 as String
End Type

I'm populating a variable of this type through a database query where
each item in the type aligns with a row in the query, so it is ideally
arranged for a simple loop. Granted, I could arrange this as an array,
but it is important to this particular application to have the UDT.

I've looked into the VBA Extensibility, but it seems a little overkill
to create a new sub on the fly to populate the UDF.

My apologies if I am repeating a recent post, but I have not been able
to find anything recent.

Thanks