Should be fairly easy I would think.
1. Open ElectronCash
2. File -> New\Restore -> MultiSig Wallet
3. Set "From 3 cosigners", "requires 2 signatures"
4. "Use public or private keys"
5. Paste in the "X1"
xprv from your disabled 2FA wallet
6. When prompted for co-signer 2, "Enter Co-signer key"
7. Paste in the "X2"
xprv from your disabled 2FA wallet
8. When prompted for co-singer 3, "Enter Co-singer key"
9. Paste in the "X3"
xpub from your disabled 2FA wallet.
This should theoretically recreate the 2-of-3 MultiSig that is identical to your Electrum disabled 2FA wallet. You should be able to see the same addresses generated, your pre-fork history and BCH coins. And because it contains 2 of the 3 private keys... should allow you to sign and broadcast transactions.
For reference:
https://www.youtube.com/watch?v=umsIy1ks8vgThe video is using LTC and BTC, but should theoretically work the same...