I'll give this another shot but here's my first attempt
Turn:
1316 - Entered UT3
1340 - found an oil lamp and wished for Mjolak
2320 - first giant plant
2751 - killed
1435 turns total
Arm Strength went from 13 to 20 in that time because of Mjolak
Killed:
38 plants
46 greater plants
12 giant plants
96 total
Final score:
1427
I had 2 cans of troll blood but couldn't drink quick enough. The main reason I died though was weak body armor (hardened leather I think)
I also had a couple scrolls of teleportation and some offensive wands. My plan if I became desperate was, I had both a ring of polymorph and polycontrol, so I'd turn into something else. Never got the chance to use any of those though, so I could've easily lasted longer. Also, never returned to UT to rest. Starvation seems very likely if you do this for too long... those kiwis aren't enough to keep you going after a while.