Steve,
We normally use an air pressure syphon can filled with solvent and reverse flush from the low pressure compressor hose all the way through the system and out the high pressure, so you should be good doing it any points between. And yes the less points you break the seal on the flare fittings the better.
You'll have to replace the dryer, but they are pretty inexpensive.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.