Nope. The N810 is the N800 with a keyboard, horrible GPS, a light sensor, a different (not better, just different) battery and mini SDHC instead of full SDHC. Hardware wise, everything else is the same. Sounds like you are out of luck... man, that sucks. Sorry.

Best way for Abiword is to PM Ryan(Megabyte) and ask to be let in on the beta. Failing that, I have a package you can use.

Gnumeric should be available from the extras repository; detailed instructions for if you get a tablet or if someone else happens across this thread: run the Application Manager, Go to Menu>Tools>Application Catalog, select "Maemo extras", tap "edit", then decheck "disabled". Press Ok, close, Ok, tap "Browse Installable Applications", tap "All", then scroll down and tap "Gnumeric" twice (or once then tap install). It's the one with the spreadsheet and pie chart icon.