Jib swiveling fairleads with bullseye

I have a non racing rigged boat - that is rigged for singlehanded sailing ( sort of ).  I have my jib sheet, cheek blocks mounted flush to the decks with a cam cleat just flush with the back of the seat.  I would like to remove these cam cleats and install a swiveling fairlead that allows me to stay aft when adjusting the jib sheets.  
I've seen the Harken and Ronstan offerings - they seem like they would do the job, but the issue is how to mount it FIRMLY to the same area as the old cam cleats ?  I have seen different applications of this idea and all looked like they get the h*ll beaten out of them and loosen up or bend.  The are would have to built up to properly accept the swivel bases round base - the current area is narrow and not flat.  I have also seen on a boat something like a fibergalss 'tower' that was shaped to perfectly fit the profile of the deck/seatlip and the swivel fairlead was mounted to that.
Anything I do on the boat has to be bullet-proof and be solid !  
Anybody have something they like that works well ?

When I purchased my Scot in 2004 I spoke with Harry and asked him if he could suggest something that would make singlehanding easier. He had the jib cam cleats mounted a bit further aft than standard and of a type that had the sheet captive under a bail with rollers that permitted use over a fairly large angle. This has worked well. Over the past 11 years there have been a few times that I was caught by a gust and wished that the cam cleats were on the centerboard trunk, but I have never changed them. 

Tie the ends of the jib sheets together so it can be picked up from the windward side without going to leeward to retrieve the opposite sheet.
A continuous sheet avoids the knot and extra spagetti in the cockpit. Get a new single jib sheet that is continuous.  This way when you pick up the jib sheet from the cockpit seat, you have both in your hand at once and do not have to go to leeward to retrieve it.
Rig a 1-to-1 jib sheet system by securing one end at the jib clew, run it from the sail to the deck block, then thru the cleat, then across the boat thru the opposite cleat, then thru the other deck block and secure the end to the sail  
Rig a 2-to-1 continuous sheet by securing to the deck car on the track, then thru the block attached to the sail, then thru the deck block and cleat, then across the boat thru the opposite cleat and deck block, then up to the hanging block connected to the sail, then secure it on the track.
This system is better for racing for the crew and better for singlehanding for the skipper.  When the sheet is grabbed, it is attached to both sides of the boat. As one side is taken up, the slack goes out the other side.
The new continuous sheet is shorter than the old 2-piece sheets, reducing extra spagetti in the cockpit.
And a single continuous spinnaker sheet works the same way.

This is what I'm talking about. The jib sheet would go through the deck mounted cheek block and then through this.  I would'nt like the cam on the trunk as it would be in the way all the time.

 Click on image to zoom

I have the cleats on the seat from the factory and they work great for singlehanding.  The continuous sheet is also a good idea.
The cleat you show above is not as strong, long term, and will be more painful to sit on, if you take people daysailing.  
You should be sitting abeam to the mainsheet block, or even slightly forward of that, when single handing, so I have never found the angle to be a problem when mounted in the factory spot.
The kit is 680390 on the FS Web Store.

I think I like what I have then. It keeps the clutter to a minimum and it's not that bad to adjust the job sheets.  I agree the harken swivel above seems to be a weak link.  Thx,though.