Actaully SL often results in a delayed onset(though extended duration)
Seriously just swallow Valium, it’s got high BA%, it is highly lipophillic and rapidly absorbed, and almost no other route works, unless you have proper solvents, and injecting it can sting failrly bad
You could plug it, though there isn’t much of an advantage one could think of
WGJ or Cimetidine with chronic administration can raise plasma levels of DZP and it’s metabolite, not sure if this would be relevant though - and considering how fast a single dose of Valium wears off, CR preparations wouldn’t be crazy, although, abusing gen could cause some perplexing questions and possibilities though