So, OP - have you moved in to the theatre yet? What did you decide and how did it work out? Would love to hear the result!
Yes! I'm in tech right now.
The turf was bought for this show and will not be used again after it closes, so I'm able to mark up as I need.
So far for temporary spikes, regular spike tape is working ok (just have to keep track of spikes coming up and replace as needed).
As for more permanent spikes: I tested out various colors of sharpie paint pens on some scrap turf.
Those seem to work really well and the scenic designer likes them. The trick will be making sure the spikes are super subtle so it does not end up looking like a field of wildflowers.
However, we're not at a place yet where I can paint on my spikes.
Once that happens, I'll report back on what we ended up doing and how it's working out.