SBM "MagnaVelocity" mushroom camshaft.

I have no experience with the whole mushroom lifter deal but this thread coming around again got me wondering; does anyone know if a "custom" lifter can be made to mushroom lifter specs? Seams like there must be a way to have them made. I know Trend offers tool steel lifters so it makes me wonder if they would make a set if someone really wanted them. Of course, I assume it is likely not a cost effective deal.