user67066: The answers to the canonical "my transaction has been pending for too long" question require hundreds of GB of hard drive and bandwidth. I cannot meet such requirements to run a full node.
How can a 15 sat/B, 389 B Segwit unconfirmed transaction to Coinbase be replaced (transaction inputs double-spent?) with a higher transaction fee without downloading the entire blockchain on a full node? 

user48884: You can use any software which is capable of broadcasting a transaction. This could be another wallet software such as Electrum or a command line tool like bitcoin-submittx.

67066: <p>The answers to <a href="https://bitcoin.stackexchange.com/q/9046/67066">the canonical "my transaction has been pending for too long" question</a> require hundreds of GB of hard drive and bandwidth. I cannot meet such requirements to run a full node.</p>

<p>How can a 15 sat/B, 389 B Segwit unconfirmed transaction to Coinbase be replaced (transaction inputs double-spent?) with a higher transaction fee without downloading the entire blockchain on a full node? </p>
 48884: <p>You can use any software which is capable of broadcasting a transaction. This could be another wallet software such as Electrum or a command line tool like <a href="https://github.com/laanwj/bitcoin-submittx" rel="nofollow noreferrer"><code>bitcoin-submittx</code></a>.</p>
