Just make sure that before you import your private keys into any other wallet to claim your new coins, that you send your bitcoins first to a new wallet (for which you will have new private keys then). That way your old private keys dont contain any Bitcoin anymore (only the new coins you want to claim), so the loss of loosing your BTC accidentally (maybe replay protection was not implemented) is reduced greatly.
I'm not sure this protects against replay protection but it does protect against things like keyloggers that could be strategically placed inside the wallet software. (Though it may offer some replay protection as well).