I have not seen sublingual route for dex listed on any of my sources.
Intramuscular dex is listed for even more emergent situations like imminent death or patient unconscious.
You can find various ranges in dose regimens for treating such as 4-8mg now, then 4-6mg every 4-6hrs. Patients response and descent to safer altitude determines duration of Rx. Remember that 4 mg Dex is about 130 mg of cortisone equivalent so it is big dose. You mentioned 10 pills, you would likely be either dead or cured by then. Save some for the other guy.
Remember that dex only covers up AMS symptoms - it does not cure the problem. The usage I refer to is for the more appropriate problem - HAPE and HACE.
Finally, no drug is a substitute for descent.
