Denys, 
 
You can use a regulator from a RV shop without any problems.  You will probably just have to bend the tubing around a little.  As far a putting a "tee" fitting in...I don't = see why you couldn't do it.  How much propane do you plan to go through on = an outting?  Just a thought. 
 
Paul
1982 Westy
"Mama"
 
 
"Once in a while you can get = shown the light in the strangest of places if you look at it right."
Paul = M.  Impellizzeri
pmi@bluegrass.net
Louisville, KY