Except that’s not the only thing the 022 can bring to the table is it? They can load up with LACMs as easy as they can with AShMs. Such capabilities are potentially even ready off the shelf.
There has been much talk about PLAN SSGNs and arsenal ships in recent years, but just a modest number of 022s can offer the firepower of such assets, while being essentially cost free to implement since it’s using existing platforms and munitions that are increasingly unnecessary in their original intended role and functions.
Why send the 022s in for no clear reason or purpose other than because they exist and that’s the role they were originally designed to do, when you can very easily, quickly reconfigured them for a critical mission at minimal to no cost?
Well, I suppose they could carry newer YJ-83 variants that have ImIR seeker that could be used in the land attack role.
But reconfiguring Type 22s for actually carrying LACMs is not as easy as you make it out to be -- the canisters themselves have a given dimension and the ship is designed to carry the YJ-83 canister in the size and arrangement or is in.
Adapting a new LACM (of whatever kind) would either require it to have to adapt to the YJ-83 canister dimensions, or you'd have to integrate and test a new LACM canister to the Type 22, both options of which aren't exactly cheap or easy. The Type 22 is a small ship where those kind of topside structural modifications can't be done as easily as on a frigate or larger.
Additionally, the PLA also has a fairly large amount of Taiwan relevant land attack fires from long range MLRS, SRBMs, bomber launched ALCMs and fighter launched SOMs, so to me giving Type 22s the land attack role with that much extra effort to integrate a LACM seems a waste of time.
Really, if one wants to make the most efficient use of Type 22s you're better off loading them with their regular modern YJ-83s, and then use that to free up a few JH-7As for other missions (like stand off land attack SOMs) which otherwise may have been tasked for the anti ship role.