I'm now just crossing my fingers that the compressors will start one way or another without a bypass. The solenoid valve idea is probably the best if they don't. One portable dehumidifier I had used one to bypass the cap tube for defrost, so they do exist for this size application. Of course the best way is to just get a TXV with a bleed port, but my project budget won't really allow for paying full new price for 2 txvs probably special ordered from somewhere, as I have not yet found a retailer that stocks any of that specific type and size, let alone any on ebay. It's a personal/school project, so ebay junk is acceptable and preferred. I know txv systems this small are not that common.