Curse my delay in taking this turn! It appears I shall have to resort to my backup plan much earlier than I had anticipated. This could pose problems for me in the long run.
According to Chapter 23, Transmution of Creatures into Map Features of Creature Transformations in TACITUS, I, as the player who summoned the worm in the first place, may now summon any creature which might reasonably be found near the feature the original creature was transmuted into, namely white sand. This creature may be placed anywhere the original creature could have reached within five turns, provided the creature is capable of standing there. The same chapter states that since the original creature was giant, the new creature must also be giant. I therefore elect to summon a giant crab. According to Chapter 3, Movement of A Beginner's Guide to the Use of Tunelling Creatures in TACITUS, the only spaces i can place it are within the crypt. Since it cannot take any further action this turn, I elect to place it as near to the entrance of the crypt as possible:
█████████.,',.,',.'.,,'',.~~~~.,',.',.,,B,
███████████..,,.,..,..,.,~~~~~',.,'.,,'.,.
██████████..W..,'',..'.,.~~~~..,;.,'.,;..'
██████████P',,,..'..,'.,,~~~~.,.'.;M.'..',
████.████...,,.';,;.''.,,~~~~,C,C.,'.,.',.
██████████ ,'.',.Ø,Ø,',.~~~~.,.'C@.,;.b¤.,
███████████,.,.o.,Ø.;,.~~~~.,'.,.';.,;'.'.
█████S██████,;',.',;,'.~~~~,.,.';,',;.;.'.
~███:::c:.,;,.;..,,.',.~~~~,..',;.',,'..,,
████M:M████.,.,'...,',;~~~~.,.'.,;.,'..,,.
███████████,.,'..,;'..~~~~~,'.,'',..,;.'.,
Since I have made no changes to the board containing the wagons, I shall refrain from reposting it.
To qwertyuiopas: I request that my giant crab, along with any units I may subsequently place on the map, be rendered in red, for the simple reason that it is my favourite colour.