climbable toy suggestions for my chinese hammy

[OG_Jam]

i hope I'm asking this in the right place its the first time ive actually asked anything on here

i got a Chinese hammy about a month ago and called her Pebbles she was 3 weeks old when i got her and has been settling in to her new home nicely i have a few things in her cage already (multiple grass hides,wheel,cork log,small java wood branch,sand bath and some wood bridges... ive noticed she enjoys running up her java wood log but its not very big/tall i obviously don't want anything too big because they cant climb as well as mice but she really enjoys climbing on stuff so i was wondering if anyone had ideas on natural safe wood climbable toys (ideally ones that don't need to hook onto cage bars) i have the savic plaza cage for her (100x50x50cm) but its "modified" (i guess) it doesn't have bars anymore and instead has acrylic screens with a lockable door the only bars are on the roof and have about a 1cm bar spacing so i don't want anything too tall or anything that hooks onto the roof in case she manages to reach the bars and squeeze through also any suggestions that are available in the uk would be great