If your wallet does not support "Coin Control"... and the 2-5 UTXOs of value are the ONLY transactions on a given address, then extracting that private key to another wallet would allow you to just spend those UTXOs... if there are other UTXOs on the same address as one of the "decent" UTXOs, then that won't work.
In which case, your best bet is to just import your private keys into a wallet that supports Coin Control and you can then use Coin Control to just spend the "decent" amounts
I can use Electrum for that.
Can you explain better how someone can do that? With images please? Step by step?