You know, one thing I love to do to fool spammers like that is actually use Quick Draw to recover ON stage. Release quick draw when you're about one full hop above the stage. As an Ike main, you should know that Quick Draw autocancels at this height meaning you can act directly out of it the instant you touch the ground - be it shielding, spot dodging, rolling, attacking, etc. What's more is that the sun Salutation won't hit Ike as he will be high enough that it misses completely. Now, you have to be clever in your timing, spacing, and distancing when doing this, otherwise you may be punished the same as before.
Quick drawing to the ledge is also a fine idea, or you could use Aether lower down so that Ike doesn't go above the stage. Again, this requires practice and knowledge to achieve, so be careful, and get your practice in. And NEVER recover ON stage with Aether, only on the ledge. Wayyyy too much endlag if you land on the stage.
And just throwing it out there, but counter can be useful to cancel the hitboxes from projectiles. If the enemy approaches you after firing, the counter may just work in your favor. Good luck!