Had company come in from out of town without notice when I opened up and started to respond. Since you have roller furling, I will approach it from what I use to do for my 170 customers as a former dealer. The key here is to have an additional line at the top of the mast either fixed to an eyestrap or to a turning block (permanent or attached to the eye strap with shackle. The option to a turning block would have that line running down the mast to a cleat tied off.
The topping lift would be too short.
Remove the front cover and supports first.
With the line affixed to eyestrap only(long enough) in hand, I would raise the mast and forestay with sail up, swing around the mast and either shrouds holding the mast, then take the line to keep the mast standing up and tie off to the forward port or starboard cleat. This was a little cumbersome getting around the shrouds.
The other option with the turning block and mast down, is secure the line to either port or starboard cleat or to the trailer winch stand that would run thru the pulley and down the side of the mast to a cleat long enough with the mast down but in the mast step. Raise the mast and then tie off the line to the cleat securely and I mean securely so it would not slip. That holds the mast in place and you do not need to go around shrouds or remove the cover unless you want to walk forward on the boat to secure the forestay.
Hope this helps. You might have to raise the mast a little with some kind of support but my memory cannot remember. Ugh. Old fartitis setting in.