HWil has a good idea. Using the existing tool bars for the cultivators, you can extend the bar out to one side, far enough to get past your wider wheel spacing. Then you can add a spade or tooth (or two) out there to do your cultivating. Nice, simple application, and should have plenty of strength. You may even be able to leave the sickle mower attached, but I'd have to look closely at where the tool bars come back and where the sickle mower sticks up. It would be close, but worth trying out. Worst case, you can just remove the cutter bar (as you were thinking about originally) and leave the mower mount hooked up.
Give it a try and let us know how you make out. Everyone loves pictures too.
Seems as if I clicked on the wrong quote in my previous message. Sorry! But Gitractorman and HWil are on to it, and I thank them. Now, to figure out what I've got, and what I need, and where to go for what is needed...These are the next steps. Ahhh, but I'm racing the weather in putting up sheep fencing! So, guess I'll take a "break" from back-breaking work and check out the cultivator collection here. I am fairly sure I'll need to find a long toolbar....
On vineyards.... I'm a beginning amateur at it. Going step by step, and at a very small scale: 80 vines total and I'll not expand beyond that. What's happened here in New England started out in Minnesota where some folks developed a hybrid American grape vine that can withstand the northern US climate and produce wine-quality grapes. "Marquette" is the primary variety that I've planted. A fellow up in Vermont grows them in commercial quantities and sells the wine that he makes. I bought a bottle and said " If I could grow that, make that, I'd not visit a wine shop." (BTW, info from the vine supplier is: 1 vine = .5 gal., maybe, & 1 gal. = 5 bottles -- so I hope for 2 bottles/vine.) These vines are ending Year 3 and had a controlled small number of grape clusters that I planed to make into wine...right about now. But someone (birds, deer, bear, raccoons??) completely cleaned me out as I awaited ripeness. Then there's a newer variety, just planted, called "Petite Pearl." So it is a ongoing deal, although probably not of a quality to compete with Europe or California. I figured the Cub could help on cultivation, and HWil and Gitractorman just perked me up.
Thanks to all. Now, to check out that L to R toolbar.