Going away during fishless cycle

I have bought my daughter a 63 litre tropical tank for her birthday.

I have also just found out about fishless cycling and this is the route we intend to go. We know we may have to be patient.

We will be going away for a few days which would be likely to be in the middle of the cycle so during that time we would be unable to add ammonia or do any testing for that time. Because of this we cannot even start the cycle for another two or three weeks.

Does it sound feasible to start the cycle now with ammonia, testing etc. and then leave some frozen shrimps to decompose in the water while away and resume when back.

Any opinions on this?