How many times a year do you step the mast? if you only raise it a couple times a year you have a lot wider choices. I strictly trailer sail so easy solo raising and lowering is essential to me. when I bought my most recent M22 the mast had been replaced with one that hinges from the rear edge of the base so leaving the stays attached was no longer possible.
I raise from the stern, as intended. doesn't your mast overbalance when raised over the bow?
That makes sense that the cam allows the side stays to remain attached. If I understand you right, even if I went down to the stern with the cam bottom the side stays could stay attached, right?
Yes, the mast is over-center on the bow pulpit when you push it out front and the top of the mast is about over the front bumper of the Honda Ridgeline I tow it with. To make it easier I created a "mast crutch" using a Little Giant style folding extension ladder that is set in the bed of the pickup and secured from tipping with a ratchet strap. The top rung gets a shop rag taped around it so it isn't metal on metal when sliding the mast. That makes it way easier. The backstay is attached to the main sheet. I lift from the bow until 20 degrees or more and the wife pulls the mainsheet in and takes it up from there as I add some assistance. No gin pole or A frame.
We (wife and I) step the mast up 3 times and down 3 times per year. Put in at our local lake end of April. Pull it out to go to Huntington Lake for a week, then back to our home lake until end of September when it is pulled out until next season.
I am thinking of having the bottom of the new mast cut to the cam shape. I've seen at least one Merit 22 or 25 done that way. That's how I'll have it quoted.