Are you looking for a LHD or a baby carrier that does everything worse than a real carrier?
A LHD would have a large well deck which is completely wasted if you want to use it as a carrier. It would also have part of a deck reserved for armored vehicles that you would want to launch the assault. A LHD would not have the same powerful motor or speed requirement as a nuclear carrier. It would not have the same endurance as a carrier. It would not have the same sized aviation facility as a carrier. How are you getting a full sized maintenance facility for your J-35 air wing? Remember, the maintenance facility size for 8 J-35s isn't going to be that much smaller than for 20 J-35s.
It's one thing to have a few J-35s on deck for a short mission and live with the inefficiencies. It's quite a different thing to go to another part of the world with it. It seems to me you want a small carrier, not a LHD.
You can have both.
With Catapults, the speed of the boat is far less of an issue.
For full-on combat operations you will need full blooded fleet carriers, but how likely is it that China will want to invade some random country in Africa or the middle east?
It’s long range amphibious assault capabilities are, realistically speaking, going to be primarily used for security assistance and stabilisation operations in support of friendly nations being CIA-coup’d; and evacuating Chinese nationals in the event of a catastrophic collapse of friendly governments to foreign sponsored coups and civil wars.
For such missions, time is of the essence. Unless China is absolutely curbstomping the CIA in the spy business, China is going to potentially have very limited reaction time to a sudden coup attempt to be able to do enough to stop it from succeeding in ousting the friendly government or plunging the nation into civil war.
That, plus the very limited number and mission set of Chinese overseas military bases makes naval action groups the primary rapid reaction force China could realistically field on the short to medium term.
In that context, you don’t need nor want to pack your LHD/LHAs to the gills with marines and armour, thus the loss of some carrying capacity is going to be of limited or even no concern.
The purpose of mini-carrier LHD/LHAs like the like of 076 I envisage would be to provide PLAN with SAGs that can carry out such missions without needing fleet carrier support. Deploying 2-3 of such SAGs centred around such an 076 would give China the rapid reaction presence it needs to hopefully dissuade the CIA from even attempting some coups while not diluting the PLAN fleet carrier fleet strengths at home.
The alternative is that the PLAN would need up to 6 additional fleet carriers to do the same peacetime missions if we factor in the rest, refit and retraining times needed after long deployments.
The J35s would be there primarily to provide fleet air defence and escort for rotor wing friendlies of such SAGs, as well as providing PLAN carrier pilots with useful experience of long duration naval aviation deployments without needing to send out full fleet carriers.
In that sense, you should get 90% of the peacetime capabilities of deploying full fleet carriers for maybe 20-30% of the costs.