Can I A) just send my btc to another wallet (for example exchange) and claim BTG later?
Yes. You will end up only sending BTC and the BTG coins will stay in your wallet to be claimed after the network is live.
Or should I first send some btc to my wallet and then send it to another wallet (for example exchange) to be able to claim BTG later (replay protected this way? Like cryptosipi said above?)
I can't confirm for sure if what he said would work. But I don't see any problem on doing it, so why not? Better to be safe than sorry.
Ok I understand, however in ledger nano s, I see an option with: add account.
Question 1)
Does this seperate account use the same 24 word seed?
Is it better to
scenario 1)
A) send 0.1 to the orginal wallet, then sweep all BTC to the new account > then hold my BTC's there?
or
B) doesn't make this any sense?
scenario 2)
A) A) send 0.1 to the orginal wallet, then add a phassphrase to my ledger nano s (SETTINGS > Security > Passphrase > Attach to a PIN) to get a new hidden wallet, this does use another seed/key? (seed 24 words + phassprhase) then my BTC's are safe and no replay attack could been used when BTG is released on the main wallet?
or
B) same as A, without sending 0.1 first, because it doesn't make any sense
Don't want to mess anything up. That's why I ask all possible options.
I don't want to lose my BTC, however losing BTG is less a problem.. (but if I can hold it both?? why not..)