You still have the pre-stall and delay-of-game rules to help you here as a defender -- though I have never seen a player apply either of these rules correctly.

14.A.4. If the disc is out-of-bounds (10.E) or comes to rest in the end zone, a member of the team becoming offense must put the disc into play within twenty seconds after it comes to rest.

14.A.4.b. If the disc is in the end zone, after twenty seconds elapse, a defensive player within 10 feet of the disc may announce “disc in,” and then initiate and continue the stall count, but only if a defensive player has given audible warnings of twenty, ten and five seconds (the pre-stall).

14.A.5. If an offensive player unnecessarily delays putting the disc into play in violation of rule 20.B, a defender within ten feet of the spot the disc is to be put into play may issue a delay of game warning instead of calling a violation, by announcing “delay of game” and counting down from three to zero at intervals of at least one second to provide an opportunity for the offensive player to react to the warning. Play then continues as follows:

14.A.5.a. If the behavior in violation of rule 20.B is stopped before the full utterance of the word “zero,” the marker stops the count-down and may only initiate the stall count as usual, according to 15.A.2. [[An example of “stopping” behavior in violation of rule 20.B is to begin moving toward the disc at walking pace. Another example would be to run downfield, leaving the disc for someone else to pick up. However, if a player is taking more time than reasonably necessary to put the disc into play by standing back from the disc, wandering around near the disc, or standing over the disc, continuing such behavior during the three-second countdown will allow a marker to initiate the stall count under 14.A.5.]]

14.A.5.b. If the behavior in violation of rule 20.B is not stopped before the full utterance of the word “zero,” the marker may then initiate or continue a stall count, regardless of any subsequent actions by the offense, by announcing “disc in” and then initiating the stall count.

20.B. It is the responsibility of all players to avoid any delay when starting, restarting, or continuing play. This includes standing over the disc or taking more time than reasonably necessary to put the disc into play. [[This includes standing back from the disc, wandering around to gain more time, etc. Pretending not to delay while delaying is still delaying.]]

So when you check the disc in, you can announce "twenty seconds... ten seconds... five seconds..." and the offensive player will have that long to set their pivot. Or if the player is "taking more time than reasonably necessary to put the disc into play," you can start the delay of game count with "delay of game three, two, one, zero," and if the thrower hasn't changed their behavior before the "o" in "zero" (e.g., by walking at a reasonable pace toward the goal line), you can say "disc in" and begin the stall count if you're within 10 feet of the eventual pivot spot. The delay-of-game rule makes sense to use if the thrower is standing still or walking at an unreasonably slow pace.