Don't wonder to much, let's make it simple: Send 5 AMP and 0.1 BTC to an Electrum address - this is safe, you will only see 0.1BTC. Now import private key of that Electrum address to Omniwallet, you will see 5 AMP and 0.1BTC. Then you can send that 5 AMP and 0.1BTC to your main wallets.