Though if you really want to take the security and usability hit of using Layer 2, there is always the option of using an exchange.
Not your keys, not your coins. Keeping coins on exchanges is not an argument.
Except, of course, that exchange trades are an example of Layer 2 trades. I'm not making an argument, I'm answering your question. You asked what Layer 2 solutions existed for the other forks of Bitcoin, so for the sake of answering your explicit question...
What security hit ?
Lightning is replete with security tradeoffs. Worth it for some, intolerable for others.
How does SV base layer handle instant payment verification with double spend protection -
Near-instant? Statistically. Amazing the things that work with five-nine's determinism when blocks are big enough to swallow all transactions generated.
1 block per 10 minutes ?
For an absolute, yes.
Even Bitcoin does not do this, without Lightning.
BTC doesn't do this,
with Lightning.