I can pretend too!
I think you can definitely do Beyond with your twins.
As far as whether to add R & S English 2, have they had an introduction to the grammar skills in Beyond? Here are the grammar skills taught in Beyond...
A brief scope and sequence of the grammar, mechanics, and usage
concepts is listed by unit below (Number ‘1’ corresponds to unit 1,
number ‘2’ corresponds to unit 2, etc.):
1 - sentences and fragments
2 - run-on sentences
3 - sentences: subjects and predicates
4 - sentences: statements
5 - sentences: questions
6 - sentences: questions and statements
7 - sentences: commands
8 - sentences: commands
9 - sentences: exclamations
10 - sentences: exclamations and statements
11 - sentences: statements, questions, commands, exclamations
12 - nouns
13 - proper nouns: first names
14 - proper nouns: full names
15 - initials of full names
16 - capitalizing ‘I’
17 - proper nouns: names of days of the week
18 - proper nouns: names of days of the week
19 - proper nouns: names of months
20 - proper nouns: names of months
21 - writing dates
22 - common and proper nouns: places
23 - proper nouns: addresses of places
24 - common nouns: things
25 - plural nouns: adding -s and -es
26 - commas in a series
27 - action verbs
28 - verbs: using ‘is’ and ‘are’
29 - verbs: using ‘was’ and ‘were’
30 - verbs: using ‘has’ and ‘have’
31 - contractions
32 - alphabetical order
33 - alphabetical order
34 - friendly letters
If they have not had an introduction to the above skills, then I would do Beyond's grammar. If they have been introduced to the above skills, you can do R & S English 2, a lesson a day. I think you will enjoy Beyond so much! It is a wonderful guide to start HOD with!
HTH!
In Christ,
Julie