Boeing says No Technical Objection. Does this mean you are on your own?

[MagentaLine]

boeing RTO

Good posts above.. I'd also add that most (all?) Boeings consider reverse thrust as 'free' as far as landing performance is concerned. Another important reason for deploying the speed brakes after retarding the thrust levers is that they are most effective at higher speeds and you are in effect transferring more weight (energy) to the brakes which should be shouldering most of the work (max brakes). Two (maybe 2.5) thrust reversers are much less significant/effective than max brakes and speed brakes.

In the US, the FAA can't hang the crew if they perform per the company SOP even if the SOP is different than the Boeing method.

I'm no fan of high speed rejects myself but v1 is there for a reason.