There will be problems fitting it.
The front connection on the 4000 is fixed, while the bumpers on a Dexta pivot. You cannot bolt to Dexta axle.
The fix for a Dexta would require cutting loader front mount and bolting to the bottom engine to axle bracket just under the engine front balancer.
I put a loader on a Dexta. You'll need Popeye arms to steer it. But, I kept the tires filled to 50PSI and it was very useful.
If you don't want to mount it, let me know and I'll make you an offer.