Unless you want a gun shop/gunsmith to do the entire job for you, there's no reason to get anyone like that involved.  As long as the mag is disassembled, it's still legal -- i.e. a mag that's disassembled holds zero (0) rounds.  I believe even in Hawaii that's less than 10.  The gun shop will charge about as much as a new mag will cost anyway, so there's no reason to go that route IMO.

I don't know what your mags look like as far as component materials go.  Chances are, if they are nonporous, you may be able to use a chemical adhesive remover.  That's for metal and I assume some polymers.  if the materials are porous, which might include other polymers, you can use acetone or isopropyl alcohol.  Be aware that acetone loves to eat certain materials like rubber and styrofoam, so test it on a tiny spot first.

You can experiment with the rattler using various products like denatured alcohol, paint thinner, acetone and so on.  That way, if you ever need/want to disassemble another one, you'll know how.  But, be prepared to get a replacement if you mess it up totally.  If that'll take time, maybe wait to play Mag Doctor until after you have a replacement.  I know you already bought another mag, but that's just something to think about if you're in this situation in the future.  Sometimes mags can be difficult to find.

I always use factory 10rd mags in place of standard capacity mags >10rds.  Never had one blocked.  If 10rd factory mags for your Staccato are available, I'd be inclined to buy those over the expense of having a new mag blocked (~twice the cost).

https://www.loctiteproducts.com/en/know-how/fix-stuff/remove-epoxy-use-these-tools-follow-these-steps.html