Kluber's availability was well advertised, and any team that wanted him was free to make an offer. So this wasn't a shock sale where other teams didn't know he was available and so didn't bid. Despite that, not a single team in the league truly thought Kluber was worth more than we got, else they'd have made that better offer and acquired him themselves. What does that tell you about his overall value around the league?
Kluber's 34, and his trajectory has been downward. He's had injury issues, he's going to be making $18M this year, and this is the last year of his contract. If he would have flamed out after his first 7 starts next year, why would anyone have traded a significant asset for him? The odds of him making a later season comeback, returning to the form of a No. 1 or No. 2, and then staying healthy and consistent for the playoffs would have been a longshot. That's certainly not what happened last year. So if he'd flamed out after 7 games, teams would be asking themselves if their $18M and 100 mph prospect might be able to get themselves something better than an aging 34 year old who just flamed out, and who would be a free agent at the end of the season anyway.
So no, I don't think that deal would have been available under your conditions. And if you think his value would still have been that high, then you'd have to question why nobody was willing to offer that right now, before he flamed out.