Few if any commercial membranes will display a significant CO2/He selectivity, so I don't think a membrane will completely replace the soda lime.
There has been work with possible commercialization on membrane contactors, with a membrane between the base and the gas stream. The system I have some knowledge of uses amines not soda lime. It was being projected for large scale natural gas operations, so it may also be a dead end.
Dave Hasse