Do I have this correct:
1.) you are going to bottle your lager dopple
2.) you want to NOT use the yeasts already alive and well in the beer.
3.) you think that some alternate carbonation is or might be available for bottling.
I think that's what I read.
This is what I think are the answers to those individual questions:
1.) I am pretty sure that no home based system will let you pressure carbonate and bottle. It takes a lot of equipment.
2.) What's wrong with the yeast in the beer? They won't hurt you or the flavor you can't kill or eliminate them without pasteurizing and filtering so unless you are pasteurizing and filtering no matter what you do the yeasts will always be with you.
3.) There is no way to bottle and carbonate using CO2 you add to the beer. Carbonation requires that you have some access to the beer in a vessel so as to apply pressurized CO2 gas to the beer without letting any escape ( pressurizing the beer keg).
Carbonating bottled beer in the commercial set up is done in a super smooth and slick high speed process where the CO2 Charged beer hits the bottle and is capped so fast that the CO2 doesn't have a chance to fizz up and escape.
I suppose it would be an interesting challenge to pressure carbonize the beer and then ever so gently rack it to bottles trying not to jiggle it and get the bottles capped without fizzing the charged beer. Interesting maybe, but definitely more work and effort than I'd be willing to undertake.