i would def not convert it.
i would go with a *** Bike to be lighter.
and go all day test drive a newer HD trike, an Ultra, so you get wind protection & other things that making riding easier when you are older/go long distances.
used HD trikes have almost no value, so find one on CL of FB marketplace to buy.
i would go ride a newer trike though, we have one, an I like it, but i don't love it.
and the newer trike with Reverse, wind screen, cruise, navi, heated grips is basically a car, and could give you another ten years of riding. we can get $200 groceries in our Trike (use a sissy bar bag on passenger seat if need more)
your converted springer could you another two years, tops?