Welcome back to the Sufferfest, 5 years is a while off the bike so I hope the Kickstarter plan is treating you well so far!
I would recommend leaving the final workout of the plan as Full Frontal as it will give you a complete view of where you are. As you have mentioned you are getting back to cycling, I would avoid doing another test the following week but what you could do is lead onto the 4week base training building block and schedule the Full Frontal Prep Week after that?
As Jon has mentioned, doing FullFrontal will get you more familiar with the different efforts and also help with your pacing of these.
To get accurate values across all of your 4DP metrics, as well as your Rider Type, primary strength and weakness, and training plans tailored to your 4DP® profile, you need to do Full Frontal. Yes, it’s more physically demanding, but it ultimately gives you more insight into who you are as a cyclist.