The first pic shows the sickle mounted over the outermost tine of a set of brush forks I built out of 1x3 .120 wall tubing - I'm hoping it'll let me get low enough NOT to have to pick up laurel trimmings by hand - the plan (wish?) is for the sickle to cut stuff and have it fall across the forks.
Second pic, same idea but using it in conjunction with the brush bucket I built - this is a 6' x 8' x 2'deep add-on, essentially a full-size pickup bed than can raise to just over 11 feet - I can climb the loader arms with this add-on attached, cut stuff, toss it over my shoulder, then when there's a pile I climb BACK over the pile, down the loader arms (('ve added foot-holds on the tops of the loader arms for this) - then drive to my burn pile, dump it, and repeat.
I built a set of large hooks that fit into the outer pair of 2" receiver hitches I added to the bucket - I can drive up to the brush bucket, roll the bucket down, catch two 1" diameter pins (one on each side), roll the bucket back, and it's hooked up.
Pic 3 shows the flow splitter, temporarily hooked up with a bunch of 45 and 90 degree fittings for a trial run - eventually most of that will get replaced with hard tubing. The pump used to go into the bottom of the loader valve - now that line is moved to the input of the flow control, the upper left fitting is the EF port which goes BACK into the loader valve - the top right fitting is controlled flow - right now it's going to bulkhead QD's on the loader via 3/8 hose, ultimately that hose will get replaced with 3/4" hard tubing (same weld-on mounts will fit) so I can mod the mounts for my 6' flail and run it on the front.
Pic 4 is slightly different mount location, I've added 2" receivers midships on both sides of the brush bucket. Not shown is the option of mounting the cutter across the bucket for trimming those pesky low-hanging branches that keep trying to remove my hat when using the ZTR. Again, lazy/old way is NOT to have to handle EVERYTHING 4-5 times
Pic 5 sorta shows the (still in process) quick attach method for the brush forks - when it's done, it should be well under 5 minutes to swap from forks to bucket, with or without the sickle.
This is all part of a larger "system" I've been adding to, based on multiple 2" receivers anywhere I might want to attach something - I've made up straight 2" tubes in 30', 48" and 72" pairs as well as various tees, etc, and usually I can find a way to do what I need to do with varying combo's of these "mil spec tinker toys" - Once I get the machining/welding done on the front quick attach system, it'll be even more versatile.
Fortunately my old Case can lift right at 4000 pounds with the loader, so adding a couple hundred pounds of stuff isn't a big deal for me. I can see where that'd be a problem for some of the smaller SCUTs though.
In your case, I might try to figure out a way to add a couple receiver tubes to both sides of your SSQA plate if they can be kept out of the way of normal use - you could then use those to add nearly any extensions/angles you want so you can see what you're doing better - my local steel supplier carries the REAL receiver tubing, 2.53 OD and 2.03 ID so it works with regular 2" tubing, hopefully you will be able to find a similar deal if you decide to go this route. It sure gives you a lot of options.
HTH... Steve
Almost forgot - I welded 2 short pieces of C channel together at a 90*, and welded one of those flush to 2" square tubing - fits any receiver, the factory swivel mount slides between the lips on the channel, seems like it'll work OK. The pics don't really show that much, if you want I'll pull it apart and get you a better shot...