As I mentioned in this post, this sounds like an ideal application of our API, which allows researchers to share R code with the specifications for a data extract (samples, variables, and other options) that other users can run themselves to download and input the data directly in R. Our ipumsr documentation website provides a vignette with sample code for submitting API data requests using the ipumsr package. We know that broader (i.e., non-API-based) functionality to share extracts with others would be of interest to IPUMS data users, but do not offer this functionality beyond sharing API calls at this time.