Do you know any local aircraft mechanics? Do you have any local maintenance facilities? I found that most are very helpful. We got our flaperons all ready, and then borrowed a rivet squeezer for a couple hours. Most are very helpful if you tell them what you are doing.
Truth be told. I did modify a Vice Grip to fit into some tight spaces desiring the rounded look to the back side of the solid rivet. First sanded and polished smooth both sides, then a shallow drilled hole as a centering point, then a rounded Dremel burr for final shaping. About $5 from Harbor Freight and a half hours work and save a hundred bucks - or more. I do have both though.
Oh I love it! Work well? I think this is the method I will use on the trailing edge. If Im using round head rivets Im guessing I need to dimple both sides...