"Progressive" geo and riding rigid
I am looking to buy a hardtail that I want to have the flexibility to setup multiple ways. I want a suspension corrected frame that can accept a rigid fork and large tires. I am also wanting to try out progressive geometry with typical longer, lower, slacker.
My question is, how slack is too slack for rigid riding? The slackest rigid bike I have owned is a fat bike with a 68 head angle. Would a Pipedream Sirius be a crazy bike to ride as a rigid singlespeed?