Bluesmoke,
Order some and see if they work for you.
Then, don't get too wrapped up with thinking that you will MUST have a die maker make a die ...
Do it yourself!
Get a hole saw or better yet, a "used-up" core drill from someone who drills in concrete. (Heavier wall thickness.)
Lay a patch template of your choosing on a 1/2" steel plate and dam/block around the edges of the patch with misc. round, flat or square stock tacked in place while flaring slightly at the top. (Welding the pieces on the outside will automatically do that for you.)
Heat the end of the saw/drill and push/drive it down into your form to shape it. (An arbor press if you have access to one works great.)
Then if needed, a bit of hand blacksmithing if you want it near perfect.
Clean and sharpen the cutting edge and you're done.
Mount your new die in the above mentioned arbor press and you can cut a really thick pile of patches (or heavy gasket material
)
Then again, you can screw a bolt into the back of the core drill and drive it with a large lead hammer to cut patches.
If it's substantial, you 'can' also use your un-plugged drill press as a light arbor press.
Personally, I have not been too impressed with the with the 'daisies' over regular round patches.
A strip of lubed patching across the muzzle and a started ball then cutting the patching off at the muzzle gives you a perfectly centered patch which in my case shoot no better than the round ones if reasonable care is used when loading.
Just remember if your 'daisy' gets askew while loading, you will suffer blow-by and really poor accuracy.
Of course, your milage may vary.
Cheers,
Smoketown