What do you think about this setup?
I would not use any ledger devices, they can literally block your transactions with their sanction compliance crap.
All their devices are closed source, most likely have a hidden backdoor, and ledger S is discontinued device.
I would not use Tangem wallet, that is also closed source, and they leaked keys over their mobile app, that is not acceptable.
Would it make sense to combine these different wallets for better safety, or is it overkill?
I would choose open source and if possible airgapped device.
As backup I would choose Satochip Seedkeeper cards, that is better option than using pen and paper backup.