Advice followed, injectors sent to RC Injectors, and yesterday (Friday) I called and the secretary said (if I may paraphrase) Oh yes, those are done, they cleaned out fine, they're ready to ship back as soon as you pay for them.
The 24 hour turnaround (as advertized) was just what I wanted, and she dug down and made it happen.
She hadn't called, as she'd been off work for a bit and had a lot to do on her desk, but now that I was on the phone, she took my debit card info and told me they'd go out Priority Mail that day and I'd see them Tuesday. So I'll probably be running this bike on Tuesday night. Woohoo!