Firstly neither I or anyone bar Avery can answer for him so who knows what options will be added to Altirra but although Avery has added far more tape items to Altirra than seemed likely I personally would doubt that being added. The reason I mainly think so is that Avery has went out of his way to add various emulated ways to load tapes as digital images, I doubt he would like to move it in to the real world considering his comments in the past regarding tape usage..
I don't even know if there's an interface to allow tapes directly from an Atari cassette unit to attach to any emulator or sampling software actually out there....If there is then great..Not really my sort of thing
Also from what little technical knowledge I have I would imagine syncing all this up to a complex (unit based?) emulation engine would not be very fun and take a lot of time and break stuff on the way..
Best advice, don't hold your breath waiting for such things...If Avery is / was interested he would most likely say..