BDA Drivers for a Twinhan (1020/1020a/102g) pci card

I currently have a working setup using Mytheatre and a (red) twinhan
1020 card with WDM drivers (DTVAudio.sys and DTVVideo.sys). I'd like
to graduate and use Media Portal and maybe experiment with MCE... both
of which I understand require BDA drivers. The problem is, I can't
for the life of me install the bda drivers!

I tried the ones included in the MyTheatre setup (878BDA.sys) as well
as the one from the twinhan website (v.1.2.3.8 (2006. 05)), but in
both cases, when I uninstall the wda driver, the twinhan card shows up
in the device manager as 2 separate entries: DTV Audio Controller and
DTV Video Controller. The BDA driver, however, shows up as "DVB-TV 878
Digital Capture Driver" and "DVB-TV 878 Digital Tuner Driver"! How do
these 2 models map to the DTV Audio and Video Controller hardware
entries?? I've tried all the different combos and nothing seems to
work... mediaportal nor mytheatre can see the card.

I read a post where someone says that that BDA drivers don't work with
diseqc switches.. is this true? I'm using a dplnb that has internal
diseqc switches. This might actually explain why twinhan's
THDrvSetup.exe setup file doesn't find the card either.. perhaps bda
with twinhan 1020 using dishpro lnbs is a losing battle?

Alternatively, is there a way for Mediaportal to work with WDM
Drivers? I found a post saying to use the drivers THBDA.inf /
THBDA.sys , but haven't been able to locate these!