Quick Bigcommerce Template Modification

We're looking for a quick bit of work with a Bigcommerce Template Modification

We're launching a Bigcommerce store shortly and have pre-purchased a template "clariss"
https://www.bigcommerce.com.au/theme/clariss-home/

We're looking for some basic modifications to be done to the template.

1) We want to update with 2 fonts that are our brand fonts. Mont (light, regular, semibold & heavy) and Roboto (light, regular, medium, bold).
2) Add our brand colours

PurpleRain
HEX #6559FF
RGB 101, 89, 255
CMYK 73, 67, 0, 0
PMS 2726

BlueMoon
HEX #00D1FF
RGB 0, 209, 255
CMYK 61, 0, 0, 0
PMS 306

YellowSubmarine
HEX #FFD700
RGB 255, 215, 0
CMYK 2, 13, 100, 0
PMS 123

WhiteRabbit
HEX #FFFFFF
RGB 255, 255, 255
CMYK 0, 0, 0, 0
PMS White

BlackBird
HEX #081833
RGB 8, 24, 51
CMYK 95, 84, 48, 62
PMS 655

We will provide a copy of the original Clariss theme to you via dropbox and the fonts.

You will develop and modify the theme as above allowing all text entries and fields to use our brand fonts and colours.