If you choose the fork stem option (neatest in my opinion) then you might opt for a RAM ball mount. One option is a device called a Telferizer made by Bob Telfer. For my 2024 RT the fitting direct from Telferizer was £46 plus £6.50 p and p. An identical fitting (of I’d bet made by Telferizer) from Nippy Norman costs £40 inc p and p