My humidity chamber uses a 300W light bulb, controlled by thermostat, for heat, and a heated condensate removal pan, controlled by dehumidistat and reversing relay, for humidity. To dry stocks, I simply remove the condensate pan, and set the thermostat for the 90-95 deg.F range. Typically, using Pro Custom finish, I'm dry in 12 hours. I haven't done much with straight boiled linseed, so don't know what the drying time would come to. I do have a friend who simply puts linseed treated stocks out in the sun to dry more quickly. Here, near Indy, humidity levels can be quite high during the summer months,[85-95%]. Heat is a strong factor, it takes you well above dew points, which alters relative humidity.
On the other hand, Mr. Ken's idea will work as well. Combining the two would probably produce almost miraculous results. I am concerned, however, about the potential for drying the wood itself, excessively, which might lead to swelling once the stock is brought back to "normal" humidity levels.
Jim