You can have multiple timelines in FCP (projects) but would have to create a compound clip of one to bring it over into another project and then the project that created the compound clip can be edited and the compound clip would update itself in the other project (if that makes sense...but I...
The C300 Mark III deal should/might come back; they yo-yo with the prices right before a final inventory flush, did the same with the C500 Mark I, C300 Mark II, multiple DSLRs.
Amazon's history says this one (but the company or item might have changed since then):
https://www.amazon.com/dp/B082M9NKGD
I used it for Hi8 and was very happy with it, quality looked great (ProRes 422 HQ via BM but probably could have done less).
E-Image's GH06/GH06F was very liked at one point, considered one of the best for the money.
https://www.bhphotovideo.com/c/product/1806975-REG/e_image_gh06f_fluid_head_with.html
B&H, brand new!
Canon always drops the prices on their tough-to-sell cameras - usually thousands of dollars, sometimes eventually more than 50% - but was surprised to see it.
But I guess the timing works out, 6 years or so, it's old...
We live in a world where a shoe company (Allbirds) just dropped its business and is taking up AI infrastructure, lol.
I can't imagine how niche what ARRI did became, maybe too difficult of a business to survive in moving forward.