I've released v1.4 of FlashAdvance Slot-1 (FAS1), the tool that allows you to flash a FlashAdvance Pro cartridge in Slot-2 from your Slot-1 device.
After using it so much to backup saves, I realized I didn't have a quick "now load Slot-2" key combo put in place. So that's now been added with L+R+START.
And here's a call to any Flash2Advance owner still remaining out there with some programming skills. See the README.TXT for information on where to find F2A programming routines that could potentially be implemented in FAS1 to support those cards.