rest in 4/4 with extra beats

How can I have the last rest as a crotchet rest in the following example? (621 KB)
In the time signature, I typed “c,7.75”.

As you see in the same bar on the staff below, I need a subdivision of 3+3.75+1. However, I could not figure it. Anyway, I want to have the same rest group as the staff below.
How could I get it?

Can you not use real grace notes?

At first, I typed as real grace notes, then I removed them and reinserted in normal notes because I thought the real note would be better for playback. However, there is no significant difference.
Yes! real grace notes would be better!

I will change them again!