If it was me, I’d just wait to see who cleared waivers and then pick one up for free.
If you spend a bunch on Stroud, you’re just going to have to pick up another QB here in a couple weeks for his Week 7 bye. Just pick up whoever clears waivers for Week 5–maybe Howell against the Bears on Thursday, or Stafford in a possible shootout with Philly (and Kupp back?) for Week 5, and then pick up Geno or Baker for the rest of the season after their Week 5 byes.