why don't you just use that hardware wallet?
I don't like hardware wallets:
for small amounts
I see. But these days some hardware wallet can be accessed from mobile which offer better usability.
--snip--
Cake Wallet exists in Beta for Linux, which leaves Feather Wallet. I'll install this (in a VPN, of course) and recover my private key from Coinomi.
FWIW, Feather Wallet also could have slow sync since it download check all block from specific block height (either when the wallet created or first time you receive Monero) due to privacy purpose[1].
[1]
https://docs.featherwallet.org/guides/synchronization