Issues I see up front:

1. not all DNS providers support all record types.

2. The object model (e.g. RecordConfig) doesn't have fields for the extra data; it only understands Priority (for MX and SRV records). I'm not convinced you can treat the entire record as opaque data; some DNS providers want text strings instead of protocol numbers for the 'algorithm' and 'digest type' fields of a DS record, for example.