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Yeah it is a good idea to use two different devices with two different BIP39 seeds. One device for long-term storage(hodl device), one device for everyday trading(transaction device). Keep in mind to use two different pins for the devices. Also mark one device or use two different color sets for the devices to be able to differentiate the two devices at all times. Also keep the devices separate from the physical backups of the seeds. If you use the same computer also keep in mind you probably need to use two custom folder paths, one for each device. Because in Ledger Live you only have one profile. The Ledger Live software always looks for the Ledger Live folder. Go to C:\Users\[your username]\AppData\Roaming\Ledger Live
If you atm manage your hodl device with LL, rename that folder to ‘Ledger Live HODL’. Set up your transaction device, the LL software will create a new Ledger Live folder. After the setup you can rename that folder to ‘Ledger Live Transaction’. From now on if you use the hodl device you simply rename the ‘Ledger Live HODL’ folder to ‘Ledger Live’ in order to enable the software to find the profile. After you’re finished rename the folder. When you want to use your transaction device, you rename the ‘Ledger Live Transaction’ folder to ‘Ledger Live’. And so on.
An alternative would be to use just a simple hot wallet instead of the transaction device.