You won't have a preflash with a non-dedicated solution.
BTW, you wouldn't need the safe sync with a Sunpak 544. The trigger voltage is relatively low with that flash.
There's a PC sync port built into this third party FS-1100 equivalent adapter's base (scroll down to the images on the bottom of th page and you'll see it). So, you'd have both an ISO standard hotshoe (like the Minolta FS-1100 gives you), as well as a PC Sync Port. Just be aware that the sync port does not offer any voltage protection like the Minolta PCT-100 would give you if you want to use strobes with higher trigger voltages.
http://www.gadgetinfinity.com/product.php?productid=16548&cat=275&page=