"Precious"? You mean expensive to maintain, right?
If you are cutting on an Avid, go straight into the Avid. The Avid will have to import & convert all that footage from FCP to MXF files anyway so you are doubling the amount of space being used on your drives. As a matter of fact, I use my Avid bay for digitizing & laying off. I use FCP / After Effects / etc on my laptop for everything else.
When life gives you dilemmas...make dilemmanade.