Is there any Morden crypto wallet that support importing mnemonic words to recover BTC, BCH, etc. ?
Electrum
is the "modern wallet" itself.
in any case if you want to claim these shitcoin airdrops then you must first create a new Electrum wallet (with a new seed) and send all your bitcoins to that new wallet. then use the now-empty seed inside these shitcoin wallets to claim the airdrops. otherwise you risk losing your bitcoins.
additionally you don't need to import the seed itself unless you have a large number of keys with coins. you can easily export the individual private keys and import those in any shitcoin wallet to claim the airdrops. go to your addresses tab in Electrum, right click on addresses with a balance and select private key.