Here is my thoughts. Looks like your tractor has the hp to handle a 7 ft bucket. Question is can the rest of the Tractor handle it. I got a koyker #5 loader with a 7 ft bucket. That loader/bucket is extremely rugged and solid. Can't compare it to this new stuff that tends to fall apart. That being I'm not afraid to lift 3000+ pounds with it, just have to put some weight on the back of the tractor. Now this tractor I got this loader on is 40+ years old and way more rugged and solid than this new stuff.
Here is the problem with new stuff. Everything is light weight and if you start "pushing envelopes" they won't take it and something breaks. Here is an example: I have a newer 30 hp 4x4 tractor with factory loader. That whole outfit is a disposable throw away set up. Loader/ bucket has dress cracks in the welds and metal. Tractor itself has had constant front end trould. There is just not enough tractor there to handle heavy use like dirt work and handle sand and gravel. As far as you putting a 7 ft bucket on your tractor, if you do a lot of heavy use with you loader, you may start having issues with the loader arms and/or front end. Now, if you put the 7 ft bucket on and just kind of pudder along using to lift heavy objects, pull fence post, load machinery (like pick up a brush hog and load it on a flat bed trailer), take it a little easy handling dirt, gravel and sand then you'll probably be ok. Might check, putting a 7 ft bucket on the tractor might void the warranty.