Yes, Helibars are a stupid price for what they are. Good marketing, just like Corbin seats.
Let as know what your riding experience is with those risers. I had put them into my Watch List on ebay.
Better to buy adjustable Convertibars if one is going down that route. I have not seen a single person who regretted buying Convertibars. Can't say the same for Helibars. The only thing is that your outlay is high up front as you do need to change all lines to get the best benefit. They are adjustable 4" up (possibly higher) and 4" back and the angle of clip on is adjustable too.
https://www.convertibars.com/product-p/honda-vfr-800-98-99.htm
AND, you can adjust the parameters in a few minutes with an Allen key when on the road so you 'tour' or 'track'.
Not sure if these have been mentioned before on this thread.
Apex clip ons are similar but their clamp is not as good as Convertibars. This was pointed out by a competitive cyclist on another forum who knew something about seat clamps. I think he said that Apex thread into the metal and will eventually fail, whereas Convertibars don't. I can't offer any opinion on that.
https://www.apexmfg.com/all-products/apex-clip-ons/apex-3-riser-clip-on-set
Windshield trimming may be required with both these.