This may be helpful – I was infuriated with various changes to the alarm in iOS 14, but then found that you can use the Bedtime feature, which, strangely, has (sort of) been moved from the clock app to the Health app, but, at least after you set it for the first time, it shows at the top of the regular alarms + it can be adjusted there, so you CAN:
-set different alarms for different days
-use sounds that are only available in bedtime but not in the regular app, including Early Riser sound (the ONLY morning alarm i can tolerate)
-adjust alarm volume separate from phone volume!! This last item may solve the problem that you’re talking about here.