FWIW, and it may not necessarily apply directly here ...But, there are clamshell adaptors for aero seatposts. The clamshell wraps around the odd shaped post and terminates in a regular round handle which inserts into a standard repair stand clamp that has been turned horizontal. Here is the only one I can think of: https://activesport.co/epages/80c85f...9&Locale=en_GB




One of the inserts looks pretty round and the tool itself is very not tall.