Just me but I'd push the pause button on that for a second.
If I remember correctly from your own thread about flying for free, you've had your SW Premier card for a few years now? (hopefully I'm remember the right person!) As mentioned on that thread, and as you just found recently, you can't hold both SW personal cards at the same time now due to the change they made a couple months ago. However, if you've earned the bonus on either card more than 24 months ago you could cancel the card you have and sign up for it or the Plus again to get the bonus. (Just have to think about what that does to your credit if it's a really old card and you don't have any other really old cards to make up for it. )
The Sapphire cards have the same 'one in a family rule' that the SW cards do now but there is a loophole to getting both if you get them both o nthe same day. Which is why we may suggest a double dip of both cards at once, so you're not locked out of both bonuses. But this also means you have 8k in spend to complete within the same 3 months to get both bonuses. The other Sapphire card comes with a higher AF and if you weren't planning to use the extra perks that come with the fee it may not make sense to pay it just to transfer points to SW. I"m sure there's more to consider but I'm trying to be brief
Like the Sapphire cards, I believe there are data points to double dipping the SW personal cards and getting the bonuses.... I think. I know there was speculation it works but can't remember if I found facts of the success yet
But that's another potential option if you earned your previous bonus more than 24 months ago, cancel current card and then try to double dip the SW cards to go for that companion pass as discussed. It gets you a bunch of points and you'd get one of your tickets for free for up to 2 years (depending on timing). Again more things to consider on that if it sounds interesting.
Another thing to consider in all this, how did you find out about not getting the Plus card? Did you apply and were denied? Was it within the past 30 days? Chase also has a rule that you can't apply for more than 2 personal cards in a 30 day period, otherwise you just get denied. So if it was the SW Plus and then the Sapphire Preferred, I think you're out of applications for a bit.