Yes, it may also suit other wide angle lens with bulbous fronts and no filter threads.
This is the basic component, the 'clamp', AKA the secret ingredient. I stumbled on this while looking for something else.
This is a '95mm Mount To Bowens Mounts Ring Studio adapter Flash Strobe' (sic)
I'm sure the seller won't mind me posting a pic from his listing as he may well sell quite a few of these if it works out.
The adapter appears to come in two parts, judging by the series of screws fixing the clamping tube to the main body, and hopefully when detached it will slide over the lens body and tighten with the three screws. I will have to use a sleeve on the Samyang as the diameter is a tad less than 95mm. I was thinking something like a rubber band made from a mountain bike tube.
I've ordered one of these and also a generic X Pro holder, and I'll have to wait till they arrive to determine the size of the adapter ring I'll need to avoid any vignetting, that being determined by location of the adapter ring with the filter almost touching the upper and lower petals on the lens hood. A 95mm adapter ring would fit nicely, but I may have to go to a 105mm instead.
If this works it should come in at less than $70.00 plus the cost of the filter, and they aren't real cheap.
I also stumbled across this listing that pretty much mirrors my concept, however if you look at it, it is showing vignetting at 14mm & 16mm, and to me that is defeating the purpose of the exercise. My set-up will look very similar however.
The Bowens adapter is coming from China so it will be a few weeks before I can update whether it is a goer on not.
Will keep you posted.