Malonaldehyde bis(diethyl acetal) support #275

Would it be possible to support Malonaldehyde bis(diethyl acetal) and Malonaldehyde bis(dimethyl acetal) as alternatives to 1,1,3,3-tetraethoxypropane/1,1,3,3-tetramethoxypropane.
It opens up to the ability to handle some cases with 2-substitutions, such as:
2-n-heptanemalonaldehyde bis(diethyl acetal) for
2-(1,1-diethoxymethyl)-1,1-diethoxynonane
I see more of the former than the latter