well, you could send your cam out for them to TRY and weld onto it to regrind.. it seems it would be difficult, but doable.
there are some benefits of having roller lifters (like stock since 87), over solid hydraulic ones.
1. less noise. since its a smoother interaction between parts, there is less clanky-ness
2. less wear on the valvetrain componants from reduced friction.
3. typically more horsepower due to the reduced friction.
on the other hand, solid lifters are great for real high rpm engines where the roller bearings might fail.
honestly, in my opinion, there is no real reason why you shouldnt be using a hydraulic roller cam and lifters.. theyre there stock for a reason: they are good.
as far as cam specs for a somewhat crazy but still drivable CVH? id say go .260 lift, .202-intake/.210-exhaust duration at .050 lobe lift. thats less than what i have in my head, so you shouldnt have the rough lopey idle and drivability problems i have had to deal with.
plus thats a big improvment over the stock .405" valve lift/.245 lobe lift. the lift is where youre going to see your biggest improvments in power, as more air is being allowed into the CC. of course a big lift cam is pointless unless the head ports actually flow that much air.