Those protections only replace or protect the tank lobes. The original parts cost €35 to replace, and do protect well on impact, but a slide on the tarmac will get through them quickly.
Those protections have their own page.
Replacement bash plate.
Those only replace the original bash plate, and most also stop using the engine as a mounting point in the rear. Note that makes them incompatible with center stands.
An inmate at advrider, Ian Chappel, is doing a batch of very nice replacement bash plates, with no engine mounts. No web site as of yet, but a PDF doc with all the info. £287.50 (plus VAT for Europe), shipping extra.
AS3 Performance list a 4mm aluminium bash plate on their web site (£180). Not available yet however, and it’s unclear if it attaches to the engine.
Black Dog Cycle Works is going the same way, building a solid replacement part. This is still in development, no price point attached yet.
Touratech offers a reinforcement piece for the skidplate (Item # 372-5158). You install it against the back of the skidplate, so you won’t be able to see it when it’s on. This add a bit of robustness to the original plate.
Those do replace the original bash plate and have ears to protect the tank as well. Those are incompatible with all other underside protections and likely to make the installation of a center stand impossible.
The first one was a plastic model from AXP Racing. It was in development, but disappeared after a few test models. The pic in the post was published then removed from multiple places. It looks promising, as it protects the bottom and replaces the side protections, and it is all plastic, AXP Racing specialty.
SW_Motech makes a giant protection covering the whole bike bottom. All aluminium, 4mm thick. Looks robust, but bolts on the engine.
Bumot has one in development. No price or availability yet. Looks like aluminium.
The consensus seems to be that crash bars are unnecessary on this bike. The fuel tank protection are all the protection you need, they are intended to be a fuse and replaced once dinged. But this will not stop third party to make some, and some people installing them.
Touratech made a video with a lot of stuff visible on the bike (crashbars everywhere, luggage galore, headlight protection, hand guards). These are slowly starting to appear in their catalog (crash bars are €240 in your choice of color: metal/black/orange).
Hepto-Becker has crahs bar in black, orange or metallic finish.
Metal mule released crash bars that protect the tank lobes. £140.
There will be more.