Quick update, just in case anyone is actually following along...
So, I gave up on the dual scissor lift idea and bought a freestanding front wheel chock (accepts up to 7" wide tire) and a single narrow scissor lift.
Theoretically, I'll be able to pop the front tire into the chock, run some straps from the handlebars to the chock's horizontal brace (which i intend to lengthen), and lift the rear high enough with the scissor jack to remove the rear wheel.
Chock: https://www.amazon.com/dp/B00GRRFLOK/ref=cm_sw_r_sms_awdb_imm_TJMARBH29YWE6HN7M98S
Scissor lift: https://www.amazon.com/dp/B08L4X6NQC/ref=cm_sw_r_sms_awdb_imm_BFZ7Y5ZJ1WV2Z4S25BDV
I have a paddock stand that I think will safely support the front end and allow me to change the front tire, especially if I slip the scissor lift under the rear of the engine cradle to keep everything stable.