I know it can be done, but I'm not sure it'd be the best decision.
I used a Master Technika for years for architectural photography. So when digital came along I wnated to stay with it, but my Linhof dealer advised me to think about the M679 and I was glad I took the advice.
The key thing is that with a tiny 37mm x 49mm sensor you'll need wider lenses which will be a problem with the Master Technika, and even more importantly you'll need much more precision when setting camera movements with a tiny sensor than with great big sheets of forgiving 4x5 film, so "geared everything" should be your watchword.
Actually for the rugged, compact style of the Master Technika I sometimes use a Hasselblad Flexbody with a digital back, because the sensor is smaller than 6x6 film there's a reasonable amount of lens movement possible, and it's certainly easier to carry and faster to operate than the M679cs!
Just my thoughts.