Nendoroids, at least the Petit Nendoroids, are a disgrace to the good smile name in how low quality they are, putting aside that they fall apart easily, their stands are practically begging to be broken.
I haven't had much experience with broken figs, but one of my figma stands did brake the other day at the tip somehow, not a big deal, but still lame.
You could always try taking a part from a cheep spare figma, if not you could try getting a plastic works type kit for duplicating the parts
that are broken from the other side that's still fine, if you can get them out that is.
Some time ago I bought a figma with a busted arm thinking I might be able to fix it, but the owner also used super glue on it and made it much harder to properly fix by doing so. he glued over parts that were supposed to be able to turn and glued parts together that shouldn't have been and I'm gonna see about getting one of them plastic molding kits to try and fix it.