Bale's attraction is at least partly he's HG so easy to slide into the squad - but he did ok last season in scoring goals once he was fit. This season he could cover all of Kane, Son or Moura as the current only alternative is Bergwijn.
I'd take him back for either 6 months or 18 months - maybe an option in Spurs favour to extend, he's certainly not a long term option, but could be financially viable for a short term contract given the number of other positions to upgrade on.
Jovic did well at Eintrach before moving to Madrid but almost nothing at Madrid nor when back on loan at Eintrach, - goal scoring record inferior to Bale.