What should I do if I need import a new private keys in my new wallet but my blockchain is pruned?
Private key is private key and you can import it to a Bitcoin full node or Bitcoin prune node wallet or with even SPV wallet too.
The issue
was: is it will be pointless if he can't rescan for older transactions due to having a pruned blockchain.
It can be imported without triggering a rescan yes, but it wont be able to scan for transactions inside the already deleted blocks.
Check his second reply to see that his goal isn't just to import the private key.
Note: I used "
was" because it may be solved already because there's no reply since OP posted that in 2021.
Greg Tonoski linked the URL for those who want to use the "
importprunedfunds method" but doesn't have a friend who owns a Bitcoin node with txindex.