Since you can already kite (15 years, wow, would think you'd have ridden everything bar the kitchen sink by now), just jump straight on the likes of delta, north, duotone ie. decent kite specific as mentioned above.
get with straps / inserts, so you can chop and change etc
go for cheap (or non cheap) banger surfboards if you decide strapless is for you and you want to try all the various dims, rocker, outlines, tails etc, but I'd say you'll be fine on whip if mostly beach slop DWer sessions. Get whatever they call the wam style these days (pro model?) if you are more often for outer reefs and down the line waves
Enjoy... foiling to come in 2030?!