How to use non-Unicode mode in VB6 with ADO.

I'm using ADO on top of OraOLEDB to connect to Oracle 9.2. The database characterset is AL32UTF8. Since my client can't handle Unicode characters, I need a character conversion. However, arcording to the OraOLEDB document( which can be obtained here http://download-west.oracle.com/docs/cd/B10501_01/win.920/a95498/using.htm#1010255):
"How Oracle Unicode Support Works
OraOLEDB works in two modes, Unicode mode and non-Unicode mode. When the client character set is not a superset of
the server character set, OraOLEDB automatically enables the Unicode mode. In this mode, OraOLEDB stores the data in its cache in the UCS2 encoding scheme. The user should ensure that the database's character set is UTF8 in order to prevent any data loss.
If the client character set is a superset of the server's, the provider operates in the non-Unicode mode. This mode provides slightly better performance as it does not have to deal with larger character buffers required by the UCS2 encoding."
My client can only use NLS_LANG VN8VN3, which is NOT a superset of AL32UTF8, so "OraOLEDB automatically enables the Unicode mode". So if I code like this:
Text1.Font="Some Vietnamese Font"
Text1.Text= rs1.Fields("Name").Value
the display is bad ('?' all over the place). This is because rs1.Fields("Name").Type is adVarWChar, so rs1.Fields("Name").Value is encoded in UCS2. What I need is to make rs1.Fields("Name").Type is adVarChar, but it seems to be impossible since Field.Type is readonly.
When I use MS provider for Oracle, I found out that rs1.Fields("Name").Type is adVarChar, so Oracle do the conversion from/to AL32UTF8 (database character set) and VN8VN3(NLS_LANG) for me.
Since I use LOB and things that MS does not support, I want to use OraOLEDB, so anyone can help me out? It's ugent.
I can see that some 3rd program like SQLNavigator4.3 work well with NLS_LANG = VN3VN8 and DATABASE_CHARACTERSET=AL32UTF8 (i.e the program convert between the 2 characterset).
Please correct me if I misunderstood anything.
I need this ugently. Any help would be appreciated. If I don't make myself clear enough, please let me know.
Thanks in advance.

Thank you for your reply. I started to think that everybody is out on holidays...
The Oracle9i Client version is 9.2.0.1.0
Oracle Provider for OLEDB version is 9.2.0.4.0
Oracle Net version is 9.2.0.1.0, in case you need it.
The Oracle9i Database version is 9.2.0.1.0
But I don't think it is a version problem, is it?

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