Hello Kevin,
Glad to see you are still around.
Question #1) You need to see D1.1, Clause 2.3.5 and 2.3.5.2 on 'Shop Drawing Requirements'. In this case you will not find a welding symbol that exactly fits the joint and weld situation. The code lays the burden on the engineer and detailer to use a detail with all the appropriate dimensions, weld size, etc and in this case partially done for you by using the Joint Details in Figure 3.5, 3.6, and/or 3.8 when using PJP, CJP, matching sides, stepped sides, and heel/toe configurations as described in the Figures.
Then, note from the text applying to the Figures that for the CJP you will need backing.
You can use a symbol as in 2.3.5.3 with 'CJP' in the tail and also 'See Detail' so they look at a drawing of exactly what you want done. But don't use a symbol that does not apply. In the long run it only confuses the matter.
Question #2) G.A.L. Gauge and others make a skewed weld gauge for measuring "fillets" (really just a weld when properly applying terminology) in the skewed joint. They run around $100 I believe. Between $80-125.
The question becomes one of if you are going to require a CJP on those sides as well or only the 'fillet' weld. It would be a "fillet" weld if it is between 80° - 100°. Beyond those angles they are welds in skewed joints and are to be detailed for clarification.
You cannot properly measure them with any other weld gauge.
Hope I explained that good enough.
He Is In Control, Have a Great Day, Brent