I'd raise that to at least 5x-10x the amount - Simply because China is expected to face-off against large number of considerably-capable enemies (US + UK + Japan + Australia + South Korea + Philippines) in case of a wider confrontation in the WestPac. Oh, and add India too, should that scope is enlarged to IndoPac.
Before continuing on this, I recall one post by
@tphuang in the now-closed Lessons for China to learn from Ukraine Conflict regarding the MLRS (
link here).
The widely-quoted range for PHL-16's 750mm TBM is ~500-600 kilometers. However, the actual range of said TBM could be as far as 910 kilometers (or slightly more), judging by what that PLAGF soldier said and brain-storming in tphuang's post:
View attachment 116444
Station those PHL-16s with 750mm TBMs in Shanghai, and key bases on South Korea, southern Japan and the Ryukyu Islands are within striking range, such as Osan Air Base (Yellow), Kunsan Air Base (Orange), Busan Naval Base (Purple), Sasebo Naval Base (Red), Kadena Air Base (Green) and Futenma Air Base (Blue).
However, this information has not been officially confirmed to be true, so take it with a pinch of salt.
In the meantime, in order to create a MLRS that could fire TBMs with ranges that can hit targets all across Japan, you can either:
#1 - Develop a longer MLRS based on the PHL-16, which could carry and launch longer TBMs in order to achieve the required range. Or, develop a MLRS based on a semi-truck chassis, i.e. the tractor unit towing the TBM launchers located on the trailer unit.
#2 - Otherwise, use this instead:
View attachment 116446
The DF-10A, which is an improved variant of the CJ-10, already has a strike range of 1500-2000 kilometers. Using DF-10A means that the entirety of South Korea and Japan can be effectively targetted, with the launcher stationed in the relative safety of China's northeastern region.