No worries at all. Yes, you can. Once you input cards from the inventory that are PC, you can view your PC and Export as Text. The Inventory recently went through an update, so it looks different, but I've been able to in the past.
As for Excel, I've never tried that with the SCF Inventory, but I think you can do that as well. After clicking around my Inventory on there just now I think I figured it out.
Once you populate your Inventory with your player collection, for example, you can Click on 'Inventory' on the left column and Backup your Inventory from there. Once it's backed up, it says "You can later Import this into a Spreadsheet format", which leads me to believe a seamless integration with an Excel document sheet should work if it's in a backed up CVS file format.
I hope this helps! If you PM on SCF I can probably send you some screenshots.
