If you're only allowed one wallet, then you'll have to find some way of creating the new SegWit wallet and then sending from your old wallet... maybe something very complicated and messy like:
- Make sure you have backup seed of old wallet
- Create new SegWit wallet with new seed
- Get new SegWit address from new SegWit wallet
- Restore old wallet with old seed
- Send all coins from old wallet to new SegWit Address
- Restore new SegWit wallet with new seed
Or you can send your coins to a completely different wallet (like Electrum), create your SegWit wallet and then send from different wallet to SegWit wallet...
No need to send my coins to Electrum. I can just import my seed.
Bread is BIP 39 and Derivation Path m/0'
Works fine.