I don't really think 'abusive to the machine' is the issue here. You can use your loader bucket to push on the ground all you want. Picking the front tires off the ground doesn't hurt anything. You can barely even drop them back to the ground hard enough to concern me, personally. The way you get into trouble digging with a loader bucket is mostly when you are prying on something only on one side in a way that twists the loader/bucket, or only in the middle of the bucket but hard enough to bend it. Any time you are trying to curl the bucket and it is loaded most of the way across it's either going to work or it's not but it's not going to hurt anything.
One REAL good way to mess something up is using any momentum of the machine to try and break something loose with the bucket. Either ramming it by rolling into it, or sticking the bucket lip under something that won't curl/lift, and then raising the front of the tractor, dropping it, and letting it 'land' on the hydraulics in an attempt to break the object loose. I've done that in a commercial skid steer on occasion but I won't do it on my small tractor loaders. Looking at the construction of the overall loader assembly and machine makes it clear why.
Honestly, working the loader to the limit of the hydraulics after a fresh treatment with the grease gun is probably easier on it long term than using it halfway to its limits if it hasn't been greased recently! The strength of the stock hydraulics is not enough for it to easily 'can opener' itself.
Anyway, it's 99% going to depend on your local conditions, but even with the easiest conditions it would probably be easier to do the majority of the work with a 3pt implement, all already said. The one FEL tool i would say is not 'bad' at this is a stump bucket.
I just trenched 900 feet of water line with a pto-powered trencher and backhoe for the rocks/roots, and even during backfill my loader buckets were only involved for maybe 1% of the process. But I used that stuff because i already have it. I don't own a plow but the angle blade would have probably been the main tool out of what i have if i was just trying to dig a drainage ditch less than 1ft deep.. turn it all the way one way, use the top and side link adjustments to angle it the way you want, and make progressively deeper passes. So you could be like me and buy 30-40yo loader, backhoe, trencher equipment (im an ASE master tech, repair everything myself) or buy a brand new loader and at least a back blade, maybe a plow too, and go to town!