I don’t understand the question. Any Catholic otherwise free to marry may do so, with a Catholic of any rite. You will generally be counseled against switching, especially to an Eastern Church with much stricter disciplines than many Roman rite Catholics are used to, unless you are marrying someone of that rite. No it is not possible to switch rites for the purpose of pursuing the priesthood as a married man, and if it is suspected you took that route would quite likely be refused for consideration for the priesthood, if that is your question. Bear in mind that in some countries, America for instance, married priests are still the exception even for Eastern churches.