SOP - not allowed to build fixes into, or alter, Rte 1.
Solution(technique) - Rte Copy Rte 1, build ETP's as along track fixes on Rte 2, display Rte 2.
Fix page - enter /511 to display circles around divert fields. Helps with visual situation awareness.
Another technique - On Rte 2 build a route from #1 divert field, to ETP #1, to divert field #2, to ETP #2, to final divert field. Display Rte 2. You end up with blue lines (Rte 2 not executed) showing the divert sectors.
Another technique - ETP is X miles short of 30W? Enter fix or lat/long, if able, into Fix page and put a circle X miles around the fix.
Another technique - Enter ETP time in 6R of Fix page.