That's fine. I don't know first hand about the hagen elite mini. I guess if you can find it cheap, it's worth a try. I'm happy with this Spot Tech but after dealing with the seller, I get the feeling he would have refunded or replaced if it wasn't working. Heck, the guy upgraded to overnight shipping for free.
And if it's only going to be temporary, you don't have to float him in a clear bowl. Maybe a plastic icecream tub or butter tub, so he stays warm, has some room and doesn't have to look at the females. Just don't leave him in there for too long and change the water a lot.