S'pect you'll need an Alton alternator next!
Good luck with the electronic gizmo though, probably 'better' for accurate timing and advance curve. Friend of mine's got one on another marque - and it certainly works well . . . when his charging system is working properly.
On the magnetic plug point, I put an SRM thing on the bottom of mine, with its easily removable plug (to get occasional wet-sumping oil out, and to enable me to drain the cases when changing the oil without having to disturb the plate) - and it's great. My only beef was that the thing is supplied with long shiny allen screws in place of longer replacement studs (because the alloy plate is a lot thicker than the old steel one). I made up longer studs, because I think those particular small threads in the crankcase look a bit vulnerable to going out of shape (although in this case they were actually OK). Good news is the whole plate won't have to come off often - and maybe that's why the kit comes with allen screws.
On the valve, I prefer feed-line taps with magneto earth or ignition cut-out built in, although haven't fitted one to the A as there is only rarely a problem (probably because the inaccessible ball in the inaccessible wotsit is a bit suspect). I was going to, but the plan never quite got finished. They work great on 2 of my oilier toys, which can fill a sump in relatively short order, deliver oil through to the poorly-sealed primary side and induce clutch slip on a grand scale. Best antidote is constant use . . . I try!
Good luck with whatever you do though, and hope the filter conversion turns out brilliantly. There's been a fair amount of stuff on that subject in the forum over the past year, which a search should throw up.