There are some options, maybe not as many as a KLR.
I had a 2009 KLR before the Versys, and I ran Motech stuff from front to rear and up and down, just my choice. It's like oil, tires and riding boots, 5 people will give you 5 opinions, none of which are right or wrong.
I used SW Motech side racks and their specific bracketry mounts to hang Pelican-Hardigg storm cases IM2600's on my previous KLR, and I loved it.
Several of us put the same rig together, using the same sources.
You could bolt or wingnut, etc the Pelicans to the Motech side racks, or use some of the hangars that Happy Trail sells. We all went with Motechs' entire system, but you could mod it and mix and match some of this.
When I put my Versys together I went with primarily the same Motech accessories, as I would at least expect the same service from them again. I use the keylock part to secure my panniers to the side racks and maintain quick release, but I did not buy the locks this time that lock the side racks to the bike. Much of this could be accomplished by using a small cable lock and some metal eyelets. Some small padlocks probably more efficient from one aspect, as my flush mounted keylocks typically filled with dust and dirt and sometimes were a bit gritty.
The Motech side racks are kicked out a bit on each side, to accommodate bikes with side exhaust I expect, and some think it's too wide. I actually like it, as it leaves room to conceal a tool tube behind each pannier.
If you end up going with MOTECH, I am glad to walk you though any of it, shoot you some pics or give you my phone number if you need a long-distance hand or have a question. Motech is notorious for having "limited documentation" with their metal-artwork, and most of that is in German.
I am running aluminum panniers this time, but this is based on MOTECH beneath it.