Agreed.. extracting from the paper - which by the way you should probably do with alcohol because alcohols evaporate more neatly, not to mention quicker - might get you manageable losses, but making the crystals seems pointless. I don't think the big loss would come from degradation as it doesn't really expose the LSD that much more than e.g. when laying blotter, but with amounts as small as 20 mg total... damn.
... even with a lab the amount lost from sheer handling (getting the crystal off of whatever you would evaporate on) mechanically /physically of so little substance is just very lossy because relatively the amount you have a hard time collecting perfectly is so high.
If you extract and evap with alcohol (has to be ethanol if you go straight to making liquid acid, but not necessarily if you decide to make crystals), in case of liquid I'd dilute it with distilled water in about 1:3 or 1:4 ratio to prevent further evapping during storage.
I'd either do multiple pulls on the paper to get it all out, or keep your blotters when you are done. Especially if they don't have nasty inks, cause it might take quite a few to get a trip from the pulled paper.
If you must have crystals, maybe like evap your alcohol in a big enough glass container at first - then when you're getting there switch to a smaller one (might want to wash out the bigger one with a very minimal amount of solvent), then possibly a third vial. In any case let this final vial be a colorless transparent glass vial and evap the last bit of solvent right in there - that way you can opt to take out a spec and save it in whatever displays a tiny crumby crystal safely, and redissolve the rest right in the vial to make the liquid.
The 'dish' (hourglass or flat one a la petri dish) wouldn't have to be pyrex, and neither would the vial I suggested have to be. Pyrex is for when you would need to heat, does not apply here. But anyway as was said: forget the razorblade idea.
I have crystal AL-LAD and have worked with it to make a minor batch of liquid for stability reasons, but I wouldn't dream of trying to make it like that. Novelty can be exciting sometimes, but there is a limit to what it's worth IMO, a bit silly just because of mythical status. But I have to admit, something like ergot in a tiny vial is a proud possession to me, I used to collect the shit out of curious things and psychedelics.
^^^ That's a good boy