Disclaimer: tomorrow is my first hang so I don't know what I am talking about. I would double the pluq and full length the mummy. The doubled pluq will hold most of the mummy weight. The mummy extending past the pluq may require a second suspension ( obviously not your permanent solution).
I dont have an UQ for my first hang tomorrow. My plan is to larks head each corner of an extra square bag and hang that as an UQ.
I got lucky on. On Monday predicted lows for this weekend were 32-34; now it's 40 ish.
Keep us posted. I think this is a topic of much interest. There seems to be a call for a UQ system to get you thru either cant afford, or not sure you will like hammocking or like you and me the interest in the new hobby came to soon before a planned trip.