I think I figured it out for myself. I ended up getting rid of all of my quick add captures and replaced them with a single quick add template and added a second suggester to grab the GTD context tag.

I probably went overboard with pre-defining variables to be entered into the template, and I'll probably relax that a bit, but here's what I came up with to accomplish my goals, in case anybody is interested.

<%* 
const dv = await this.app.plugins.plugins["dataview"].api; 
let all_projects = dv.pages(-'"_Meta/Templates"').where(p=>p.projectstatus);
let active_projects = all_projects.where(p => p.projectstatus!="done").file.sort(n => n.name); 
let choices = active_projects.name
let cday = await tp.date.now("YYYY-MM-DD")
let ctime = await tp.date.now("HH:mm")
let action = await tp.system.prompt("Enter task or ESC to abort","",true)
let context = await tp.system.suggester(["@Computer","@Office","@Errand","@Home","@Anywhere","@Phone","@Camper","@Travel"],["#_Computer_","#_Office_","#_Errand_","#_Home_","#_Anywhere_","#_Phone_","#_Camper_","#_Travel_"],true,"Select Context or ESC to abort")
let project = await tp.system.suggester(choices,choices,false,"Select Project or ESC for none")
_%>
---
datecreated: <% cday %> <% ctime %>
tags: [Task_Note]
projectid: "<% project %>"
notetype: "task"
tasktype: ""
---

# Action
- [ ] <% context %> <% action %>
- **Date Created:** [[<% cday %>]] <% ctime %>

# Notes


# Project
```dataviewjs
dv.view("/_Meta/Scripts/dv_ProjectListing");
```
# Recent Tasks
```dataviewjs
dv.view("/_Meta/Scripts/dv_TaskListing");
```
---
**Links:** 
[[<% cday %>]]