You'd maybe change your tune shooting medium format with filters; 400 in full sun will give f/10 1/125 with red-25, or f/14 1/125 with a CPL, both of which make for a decent handheld hyperfocal shot.
If you need shallow DOF in full sun, stick a CPL on there (you DO carry a CPL at all times outdoors, right?). Most 35mm SLRs can do at least 1/4000 and with a teensy bit of overexposure you can happily shoot at f/2 in direct sun. If that's not shallow enough, geez, get closer to the subject or something. Or shoot 1.5 stops over (totally fine on any ISO400 negative you can name) for f/1.4.
TMY2 will do a very good 1600 in Xtol though it's contrasty. D3200 likewise without the huge contrast but the grain is much larger.