Hi Jay
To convert from mast mounted winches to cabintop position next to companionway (the usual position),
you will need new halyards, blocks mounted at the base of the mast, a method of fitting these blocks to the mast base, turning blocks to bring the lines on a 90 degree turn back to the winches and a cleating system of your choice there.
The winches will need to be removed from the mast and mounted on the cabintop with solid mounting pads inside the cabin and maybe tapered mounts on the cabintop for correct line alignment.
If your halyards are internal, you will have to have a clean exit from the mast down to the mast base block.
This will result in.
1. More cost than your are expecting.
2, More effort in hoisting the fore and mainsails than you are expecting because of the extra turns.
3. More work.
At the moment with mast mounted system, you have the system the Chichester and Knox-Johnson used to sail around the world (admittedly a long time ago).
In a pinch with you present system you can use the boom topping lift as an auxiliary mainsail halyard.
You go to the mast, lower the main. hook the reef cringle onto the reefing horn, pull the luff reef down and cleat off to the boom. If the main gets snagged or doesn't run up or down freely, you are right there.
Beware of the newest sexy gear. Some of the older stuff is better than you think.
If I were you, I would leave it as it is and get really smooth and efficient at using that rig.
gary
PS a bit of clarity