There is nothing magical about a 7 day week that means you have to fit your programming to it.
I do a kind of modified PPL, effectively PLPL, because strong legs is a priority to me. So it’s a 4 day split. I usually train 6 days a week, but sometimes 5, sometimes 7.
So in a given week I may hit my glutes and hamstrings once, but back twice. Next week would be opposite. Over the course of a month or longer, it evens out, and I get plenty of frequency in for each body part.
Awfully optimistic of you to assume he will be gone in 4 years…