Yes, one idea is to simply eliminate the chipotle peppers here in this recipe. Replace it with mild chili powder (1-2 teaspoons) and some smoked paprika and cumin making this change doesn't have as much liquid, add vegetable broth to get it to a pourable consistency. Another of my favorite marinades to use when making grilled tofu skewers, is Chimichurri sauce. It also has a bit of chile in it but is less spicy than the chipotle marinade and you can of course leave it out if you prefer. Use the Chimichurri sauce here in this recipe for Crispy Chimichurri Potatoes.