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I am using the stock tank selector valve for my WMO/diesel blend and haven't had any problems. I don't think the increased viscosity is an issue for the valve, especially if you are preheating the tank.
I don't believe preheating the diesel fuel will do any harm either. I have heard some rumors that heating diesel fuel actually helps have more complete combustion. I think most of the VO guys recommend heating to only about 150*F though, so you may want to consider thermostat control for your heaters.
I am not sure how well the VO will blend with diesel fuel either, someone who's using it will have to chime in with that information.
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1986 F250 2WD Super Cab XLT Lariat w/ 1996 front clip. Dually bed & van rearend (2" wider, allows spring clearance). 6.9 w/ approx 120,000mi. Banks non-wastegated turbo system, Wellman G088 glowplugs, Delphi BB injectors, Kenworth pyrometer, vac/boost gauge, electric water temp/oil psi/voltmeter mounted in dash. 3" Mandrel-bent open exhaust. C6 trans, 3.54 gears. Okiegringo idler pulley. R134a A/C conversion. WMO/diesel blend in one tank.
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