Karoo Actions not available with SRAM Force AXS E1 Bonus Buttons — only AXS Action shown

Hi,

I'm reaching out regarding an issue with Bonus Button configuration on my setup.

My setup:
- SRAM Force AXS E1 Upgrade Kit (shifters + Hammerhead Karoo 3) (new ones)
- SRAM RED AXS D1 rear and front derailleurs (old ones)

The shifters have Bonus Buttons. When I go to Sensors → select my AXS groupset → Configure Controls and try to assign an action to a Bonus Button, I only see "AXS Action" (gear shifting) as an option — there is no "Karoo Action" available at all.

According to your documentation, the pre-requisite for Karoo Actions is: "Ensure that the shifters are paired to your main AXS component." My shifters are paired to the rear derailleur.

My question: is the absence of "Karoo Action" related to the fact that my derailleurs are RED AXS D1 (previous generation, not E1)? Or is this a known limitation of Force AXS E1 shifters regardless of derailleur generation?

I've read in the community that Karoo Actions via Bonus Buttons may only be available with RED AXS shifters, not Force AXS. Could you confirm whether this is the case, and if there is any workaround short of purchasing AXS Wireless Blips or upgrading to RED AXS E1 shifters?