TC, level the other classes to 60. Outside of Culinarian, there is a lot of materials interdependency in HW recipes. Use the Moogles beast tribe, and the GC Hand ins, to supplement the crafting log and Leves. Crafting is still very much an "all or nothing" affair, and I really do not see SE changing the Specialist system around to actually allow someone to only level one or two classes, leaving the others at 0 or 15.
If you intend to do starred recipes, aim for the minimum Craftsmanship (995) and Control (955), with the most CP you can get (430). After you reach that point, try to squeeze in as much more Control as you can. For just Red and Blue Scrips, the white i150 (and lower, for accessories) HQ set, without even many melds, will be sufficient. To go higher, you will want to meld, or better yet, find someone willing to make the i190 gear for you (supplying the materials would do wonders to reduce the cost, I'm sure).
My basic thing for Scrips has always been basically to use Rapid Synthesis as much as possible. Go to one or two Careful Synthesis 2's if a second Rapid Synthesis will finish off the craft. Then just focus on Quality, ending with a Byregot's finisher. Something along the lines of :
Comfort Zone, Inner Quiet, Steady Hand 2, Rapid Synthesis (fail), Rapid Synthesis (success), Careful Sythesis 2, Precise Touch (GOOD condition), Careful Synthesis 2, Steady Hand 2, Hasty Touch, Master's Mend 2, Hasty Touch x3, Steady Hand 2, Basic Touch x2, Great Strides, Innovation, Byregot's Blessing, Careful Synthesis 2.
Obviously, that will require modification. That assumes one RS and 2 CS2's for Progress, with a third CS2 (or a second RS) finishing it. Also, Hasty Touches can be converted to Precise Touch if the Condition and CP allow it, and Basic Touch if CP allows it. If you need two RS's, and no CS2's (after two RS's one CS2 would finish it off) then obviously get those two RS's in and then just start on the Touches. If it is a low enough recipe that one RS and one CS2 get you to the point that a single additional CS2 will finish, then don't take that second CS2 and work instead on Quality. It really depends upon what GOOD/EXCELLENT Conditions you get, as well as how much Progress that a CS2 and that a RS will give you. Basically though, one successful RS will give you just over the Progress provided by two CS2's. Use that to your advantage.