Agree, bigger LPD (200-210m) and fill it with this would be absolute menace.
but KSR program is probably just another sayembara to support local defense industry.
while everyone mostly doing it in secrecy and rarely documented, here's french flexing the Hypersonic Glide Vehicle to their fellow european counterpart.
https://www.tnial.mil.id/berita/60310/BANGUN-KERJASAMA-KEAMANAN-DAN-PERDAMAIAN,-KASAL-KUNJUNGI-AL-PRANCIS/
ENHANCING SECURITY AND PEACE COOPERATION, KASAL (Navy Chief) VISIT FRANCE NAVY
Chief of Naval Staff (Kasal) Admiral TNI Muhammad Ali paid a courtesy visit to Chief of French Navy Admiral...
to design vessel that can goes down into such depth is hard, there's no way you're going cheap or making a shortcut to developed that, even most advanced DSRV (Submarine Rescue Rover/Vessels) developed and manufactured by experienced and well established company won't go down that deep (mostly...