Hi. here are some other stands that have flat bases. Premier made some nice ones, with cast steel legs of various designs. The legs tightened with a big wingnut underneath and folded up along the column when undone. They are out there under Premier, Olympic and Beverley names but are basically the same pedal. Some have cast aluminum footboards and some labelled Premier have a black rubberized footboard. They are a little heavier than the Trixon pedal.
There were also some 60's Sonor flatbased stands. Ajax(Boosey&Hawkes) produced a very similar pedal to the Trixon between '67 and '70. It has a hammered blue cast aluminum footboard and spring loaded legs , like Trixon. It is called the Ajax Accelerator. If anything , they are a better stand than Trixon.
Trixon stands(almost always, the ones with the chromed, stamped footboard-not the older TZ 1, with the cast aluminum footboard) ,come up on ebay fairly frequently and usually go for a reasonable price. If I see one I'll send you a message.