Just listened to destroyer captain by captain Hara and beaching wasn't mentioned.
Fighting the USN was and any survivors were to fight on at Okinawa.
So they were sharpening bayonets on Yahagi.
Since getting to Okinawa was rated between zero and nil then it may have been moot.
So it may or may not but beaching was not a primary goal but the troops were expecting to fight on land. So they thought the ships would beach to action this goal. And the beaching idea comes from them and not the senior officers.
The goal of Ten-Go was the destruction of Yamato. She was the flagship and the darling and turning away at Samar was considered cowardice in army circles. So the idea that Yamato would survive the war swinging at anchor was considered dishonourable. So she had to die in a blaze of glory to prove the IJN fought to the last bullet. The Hotel Yamato jibes did hurt and what better way to disprove this by getting all the crew killed.
The idea as I understand it was that Yamato would sail for glory, and to end the mission shoal itself and be used as an artillery platform supporting troops on OK. I'll look up sources if you'd like. No doubt IJN leadership did not want to go down without a swing. But beaching and shelling was certainly the end of the plan so far as I've read. From the US Navy's perspective:
Vice Admiral Ito initially objected to the mission, viewing it as futile and wasteful. According to the plan, Yamato, light cruiser Yahagi, and eight destroyers would form a “Surface Special Attack Force” (the term “special attack” was understood to mean suicide) and sortie on 6 April 1945. This would be carried out in conjunction with a mass aerial kamikaze attack by over 350 airplanes (Kikusui No. 1). The force would transit to Okinawa on 7 April (with only a few hours of minimal air cover), to arrive in daylight hours in the U.S. transport area off southwestern Okinawa on 8 April. The ships were to sink as many troop transports as possible, then beach themselves and continue firing as long as they had ammunition. At that point, the crews would go ashore to fight and die to the last man along with their army comrades.
H-044-3: Death of Battleship Yamato
Obviously any Japanese plans extant would trump this analysis. Did the Japanese plan to return those ships?