Don't do it for 2 reasons:
1- M1t causes extreme shutdown, you do not want that at the end of a cycle. Save the m1t to jumostart a future cycle.
2- You would be stacking 2 of the most toxic methyls available, bad idea.
Either lower the dosage & spread the 1ad out over 5 weeks, get more 1ad, or run the M1,4 alone the last week.