I'd play 1D-1H-1S-1NT-2C as natural, non-forcing. Typical hand is 4054 12-17, a little more if 4144 or 4153 perhaps 15-17. With 18-19 and a similar pattern opener should try 3C rather than 2C.
Responder should stretch to bid again with more than a minimum, because opener could still be quite strong. In this sequence with my favourite partner, 3C would be a simple courtesy raise and 2H (the impossible rebid) would show a great hand for clubs with nothing wasted in hearts.
1C-1H-1S-1NT-2D is also natural and non-forcing, but slightly stronger (as playing in 2c is no longer possible). Perhaps 4045 14-18 or 4144 16-18. Once again responders (impossible) 2H would show a super hand for openers new suit (in this case diamonds).
Just my 2 cents,
Mike

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