You raise some good points, wasn’t aware of the RDM modification for the 530Ds, I thought they all got the RDM+ with 530D support!
I guess a Qatari 2000-9 could indeed work, I’m not gonna discard the B501 despite the things you said being very valid, it would still be a decent contender imo, on par with the EM VI due to having much much better flight performance than an F1. Although only 2 missiles is certainly a detriment.