It is possible to hide the 3 above triplets by changing the time signature to one that has triplets built in such as 6/8, 9/8, or 12/8. All staves would be in this time signature, but it is possible to change for example, a 9/8 staff to appear to be in 3/4. The following example is 3/4 - 9/8, but is applicable to 2/4 - 6/8 or 4/4 - 12/8, etc.
A 3/4 time signature (default visibility) would immediately be followed by a 9/8 which is hidden on a displayed staff. A 9/8 time signature (default visibility) by itself is OK on hidden staves.
On the played but hidden staff, all non-dotted non-triplet notes would need to be dotted. Notes already dotted would be tied with a note with half the length of the original. The triplet attribute would need to be removed for any triplets on that staff. Often a dotted-eighth followed by a 16th would be played as quarter & eighth, so this change might also be necessary.
On the displayed but muted staff, dotted notes would be replaced with undotted notes and a hidden rest with half the length of the undotted note. If the note was originally dotted, its tie can be removed and the note following replaced with a dotted rest, again with half the length of the previous note.
On the displayed staff, add in "Staff Italic" a 3 over the middle notes in the first few triplet sets and simile once the triplet pattern is established.
These ideas are demonstrated in the attached file.
Other related tips are in Notating Pentuplets and n-tuplets (vs m-tuplets).
A webpage to help with this is Triplets.htm. The user has to add the 3 over the middle notes in the first few triplet sets and simile if desired, but the page handles the first three things on the list.
There's no real need for a hidden staff since you can hide the unwanted dots with extra dot spacing set to -0.1.
In bar 9 it is slightly trickier since you have to keep the dots displayed on the dotted rest and note, and insert hidden rests to achieve the correct length.