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You don’t have to lap the tiles, but you get better adhesion and grit to razor contact on the film. They lap easy with 80, 220 grit wet & Dry, finish with some 400 or a diamond plate on a dollar...

Buy 4 glass 3X12 tiles from Lowe’s $20 and you’re done.

Or Norton, Naniwa, Shapton or King 1,4,8 or there about, set or combo stones, brand does not matter. Paste a strop with razor quality Chrome...

What do you mean by upgrade? If you are getting good results and you should be with film, better than only a handful of stones, what improvement are you looking for?

Forget the Swaty, it is 6-8k...