Here are some things to consider. If you have hardware cloth as the floor of your hive like in the screened bottom board, the beetles can get through it but the bees can't. You could have a solid board below this. This opens you to do things that you can't really do on a solid one. There is a video of a guy using one of these IPM screened floors and on the bottom below the screen he puts a piece of vinyl table cloth flanel side up. That has the same effect that the swiffer sheets do in that it tangles their feet and they die over time.
If you are using DE it is basically a vat of razor blades that slices their exoskeleton and they desicate and dry out, basically bleed to death, death by a thousand cuts.
If you try the boric acid in lard/crisco it is certainly a poison but I think the action is more of a caustic than toxic.
If you use outside the hive, the nematodes then you have a predator, that is kind of species specific and doesn't do harm to the bees. And atleast one of the nematode varieties actually attacks adult beetles. I am not sure if anyone are able to get nematodes to live in their eco-floors, but it is a question worth asking.
So on the CD traps, why not put some bait in the middle, and coat the whole side of the case with tanglefoot. The beetles can get in, but the bees can't. Likewise with your jar traps on the floor. If you are worried about your hardware cloth being larger so that the bees can get in it, or you are concerned that they may propilize it, how about tacking a shim over the top with a thin standoff perhaps a pop-rivet washer or a dime or a few pieces of playing card. The beetles can get underneath it, and the bees will happily chase them underneath it but can't follow.
These beetles are the devil. I had a good bit of luck using that NeverWet Flanges method. If you search NeverWet and Small Hive Beetle on youtube you will see his videos.
There is also another fellow that has changed his entrances to be what looks like pieces of pex pipe. The claim is that beetles can't hover like bees, and can't get in the pipes as well. He has some videos of that.
There is also the Guardian entrance reducer thing. I still don't understand what it is doing, but it looks like it does something in the video.
On Billy Davis' videos where he explains their hive design changes they have well fitting joints, and insect screen around the hive, which is open mesh "all the way to the ground" where there are nematodes. The beetles can't get in from under the hive, and there is a very small 2" by maybe 3/8" covered with a small robbing screen that makes a very defensible entrance thus reducing the adults entry opportunities.
https://www.youtube.com/watch?v=dnqsV8b0CBcI cringe to see FatbeeMan staple poison to the bottom board of his hives, but his videos say it is effective. I really wouldn't want DE inside my hive either, but if my rack was screened to the ground and I knew my bees couldn't get under there, I wouldn't mind having both DE and borax all over the place under there. Take care of the stupid ants while we're at it :)
I am in the process of regrouping so thoughts of redesigning some of my equipment in the process are up there. I may abandon my racks for the type of stands that Billy describes in his video and maybe some other things. But I know that it is not a singular method to fix the SHB. But in any event you gotta do more than one thing. Though keeping a strong hive is a mantra I keep hearing.
BTW, you don't have to use used cooking oil, but it is an attractant. Also for other critters too :) But if it is close to your home, you can use soapy water. They will drown in that just as well.